---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Thu 08/21/14: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:43 AM - capacitor (George Bearden) 2. 05:31 AM - Re: Re: Radio intercom (Robert Laird) 3. 06:22 AM - Re: Re: Radio intercom (Frank Goodnight) 4. 06:39 AM - Re: FAA question (Charlie England) 5. 07:18 AM - Re: Re: Radio intercom (Herb) 6. 07:36 AM - Re: FAA question (B Young) 7. 12:19 PM - Re: Re: Radio intercom (Samuel Ragland) 8. 01:21 PM - Re: Re: Radio intercom (Dennis Rowe) 9. 01:22 PM - Re: Re: Radio intercom (Dennis Rowe) 10. 01:38 PM - Re: Re: Radio intercom (Samuel Ragland) ________________________________ Message 1 _____________________________________ Time: 01:43:04 AM PST US From: "George Bearden" Subject: Kolb-List: capacitor > Its the large one, 20-25000 I asked out of curiosity, but I know this value is not a critical thing. Greater or lesser will probably work the same except in extreme cases. This depends on the current you are pulling and the nature of transient spikes (hash, static) you have in your power. Those tiny lil pale orange ceramic disks found on computer equipment do the same thing. They can be tiny because the current is tiny and the supplied power is generally very good. They do have to suppress the tiny spikes generated by the opening and closing (cycling) of the electronic gates inside the chip. The voltage spec is more important. With very dirty power and pulling a lot of current you will need a higher voltage. When a spike hits the cap it can puncture the insulation and element inside (foil generally) and short it out, if it is high enough voltage. You can test for this by the way a cap holds voltage in it. It should be able to hold a given voltage overnight. Its hard to measure though! But in the morning if it bumps your meter needle then it is probably good. A bad cap potentially could drain a small battery. Not something you are likely to see every day. > some one furnished earlier says the ground should go straight to the battery It is very important to have an excellent ground on everything electrical on the plane. You can hook the cap to any ground and it will work but for extra insurance going to the battery is better. Sometimes extra engine grounding pays dividends in a variety of ways too. ________________________________ Message 2 _____________________________________ Time: 05:31:41 AM PST US Subject: Re: Kolb-List: Re: Radio intercom From: Robert Laird On Wed, Aug 20, 2014 at 7:44 PM, Larry Cottrell wrote: > Its the large one, 20-25000, I can't remember and I have it cushioned Thanks, Larry, for saying this... it's a VERY good practice to cushion the heck out of the capacitor... it's wall is very thin and it will get rubbed through in no time if you don't cushion it well! -- Robert ________________________________ Message 3 _____________________________________ Time: 06:22:28 AM PST US Subject: Re: Kolb-List: Re: Radio intercom From: Frank Goodnight After reading everything I could find about capacitors , it seems that a A/C capacitor can be used anywhere in place of a DC because it is non polarized. A DC cann ot be used in a AC circuit or hooked up with reverse polarity or it will burn up. T he only reason for a DC is that it is 1/2 the price of a AC. I don't know if this is fact o r fiction. As I am having trouble finding a DC 22,000 mf would someone that is a little more kn owledgable than me please tell me if a AC will help reduce the engine noise when I tran smit. Frank G Fayetteville AR MK 3 Classic ULS Sent from my iPad On Aug 20, 2014, at 8:32 PM, B Young wrote: > Another devise that can help is an inductor... a lot of car audio systems use them... home brew by wrapping a steel nail with the power wire and put it I am old film canister or small pill bottle. Or wrap the wire around a f errite ring.... want belt and suspenders ,, use a smaller capacitor befor e and after the inductor. For the right size I'll have to look when I get home > Boyd > > On Aug 20, 2014 6:46 PM, "Larry Cottrell" wrote: >> Its the large one, 20-25000, I can't remember and I have it cushioned and tie wrapped to the side of the cage. There are two screws on the top of the capacitor. One + one -. The hot wire going to the radio goes to the + and c ontinues on to the radio. The - goes to the ground bar. The info that some o ne furnished earlier says the ground should go straight to the battery rathe r than to a common ground. I will have to change that as soon as I can. >> Larry >> >> >> On Wed, Aug 20, 2014 at 5:45 PM, George Bearden wro te: >>> >>> > Larry said; >>> "I installed a large capacitor (per John Hauck) and it now transmits lou d >>> and clear. The only noise that I hear in it is the quiet click of the >>> strobes" >>> >>> Hope mine sounds that good. That's incredible. I assume the capacitor is >>> used as a by-pass, from hot to grnd? Do you recall the value? >>> >>> Sporty's SP-200 >>> ICOM IC-A20 >>> IC-A2 >>> >>> >>> >>> >>> ========== >>> -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List >>> ========== >>> FORUMS - >>> _blank">http://forums.matronics.com >>> ========== >>> b Site - >>> -Matt Dralle, List Admin. >>> target="_blank">http://www.matronics.com/contribution >>> ========== >> >> >> >> -- >> If you forward this email, or any part of it, please remove my email addr ess before sending. >> >> >> get="_blank">http://www.matronics.com/Navigator?Kolb-List >> tp://forums.matronics.com >> _blank">http://www.matronics.com/contribution >> > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 4 _____________________________________ Time: 06:39:53 AM PST US From: Charlie England Subject: Re: Kolb-List: FAA question I went through this about 20 years ago. Bought a plane in Michigan; trailored it to MS. Because of the change in test area, I had to get the local FSDO to give me a new test area in the paper work. After that, no issues. If the buyer is in the same area as the seller and can use the same test area, he shouldn't need to do anything except finish the test time (after checking the plane very carefully, of course...). Charlie On 8/20/2014 11:48 PM, Bob wrote: > There have been a number of the EAA Webinars that have touched on this > subject. The answer was always- not a big deal, but the new owner > may not get credit for all the previously flown test hours, and may in > fact sometimes have to start from scratch...depends on you FSDO > discretion. I would call one of the EAA Oshkosh gurus who have > seen this many times before....Id get their info on the regs and case > histories then make the call to the local Friendly Aviation guy. > Should not be a big problem.... > Bob > *From:* Larry Cottrell > *Sent:* Wednesday, August 20, 2014 8:34 PM > *To:* kolb-list@matronics.com > *Subject:* Kolb-List: FAA question > I have an acquaintance who is considering buying a plane from a guy > who has not flown off his test hours completely. Is this going to > cause more trouble than it is worth? > Larry > ________________________________ Message 5 _____________________________________ Time: 07:18:40 AM PST US From: Herb Subject: Re: Kolb-List: Re: Radio intercom Good capacitors are in every junk piece of electronics at the salvage yard...anything from 1000 mfd on up should work.. Computer, switching power supplies use 400 to 600 mfd in the first section of the supply...just past the full wave bridge...even those may be enough...two in parallel would double the capacity... frugal Herb.... On 08/21/2014 08:22 AM, Frank Goodnight wrote: > After reading everything I could find about capacitors , it seems that > a A/C capacitor > can be used anywhere in place of a DC because it is non polarized. A > DC cannot be > used in a AC circuit or hooked up with reverse polarity or it will > burn up. The only reason > for a DC is that it is 1/2 the price of a AC. I don't know if this is > fact or fiction. As I am > having trouble finding a DC 22,000 mf would someone that is a little > more knowledgable > than me please tell me if a AC will help reduce the engine noise when > I transmit. > Frank G > Fayetteville AR > MK 3 Classic ULS Sent from my iPad > > On Aug 20, 2014, at 8:32 PM, B Young > wrote: > >> Another devise that can help is an inductor... a lot of car audio >> systems use them... home brew by wrapping a steel nail with the >> power wire and put it I am old film canister or small pill bottle. Or >> wrap the wire around a ferrite ring.... want belt and suspenders >> ,, use a smaller capacitor before and after the inductor. For the >> right size I'll have to look when I get home >> Boyd >> >> On Aug 20, 2014 6:46 PM, "Larry Cottrell" > > wrote: >> >> Its the large one, 20-25000, I can't remember and I have it >> cushioned and tie wrapped to the side of the cage. There are two >> screws on the top of the capacitor. One + one -. The hot wire >> going to the radio goes to the + and continues on to the radio. >> The - goes to the ground bar. The info that some one furnished >> earlier says the ground should go straight to the battery rather >> than to a common ground. I will have to change that as soon as I >> can. >> Larry >> >> >> On Wed, Aug 20, 2014 at 5:45 PM, George Bearden >> > wrote: >> >> > >> >> > Larry said; >> "I installed a large capacitor (per John Hauck) and it now >> transmits loud >> and clear. The only noise that I hear in it is the quiet >> click of the >> strobes" >> >> Hope mine sounds that good. That's incredible. I assume the >> capacitor is >> used as a by-pass, from hot to grnd? Do you recall the value? >> >> Sporty's SP-200 >> ICOM IC-A20 >> IC-A2 >> >> >> >> >> ========== >> -List" >> target="_blank">http://www.matronics.com/Navigator?Kolb-List >> ========== >> FORUMS - >> _blank">http://forums.matronics.com >> ========== >> b Site - >> -Matt Dralle, List Admin. >> target="_blank">http://www.matronics.com/contribution >> ========== >> >> >> >> >> >> >> -- >> /If you forward this email, or any part of it, please remove my >> email address before sending./ >> >> * >> >> get="_blank">http://www.matronics.com/Navigator?Kolb-List >> tp://forums.matronics.com >> _blank">http://www.matronics.com/contribution >> >> * >> >> * >> >> ================================== >> ://www.matronics.com/Navigator?Kolb-List >> ================================== >> cs.com >> ================================== >> matronics.com/contribution >> ================================== >> >> * > * > > > * ________________________________ Message 6 _____________________________________ Time: 07:36:01 AM PST US Subject: Re: Kolb-List: FAA question From: B Young I would not think so... my first question would be why he did not fly off the hours. Did he not lunge the way it flies, got sick. Had to move for a new job, etc. Boyd On Aug 20, 2014 9:46 PM, "Larry Cottrell" wrote: > I have an acquaintance who is considering buying a plane from a guy who > has not flown off his test hours completely. Is this going to cause more > trouble than it is worth? > Larry > > -- > *If you forward this email, or any part of it, please remove my email > address before sending.* > > * > > > * > > ________________________________ Message 7 _____________________________________ Time: 12:19:13 PM PST US From: "Samuel Ragland" Subject: RE: Kolb-List: Re: Radio intercom Dear fellow Kolbers I don't know much about capacitors but is bigger better? Back in my car audio days we used "1 FARAD" capacitors. These held power in reserve so at night when you were driving, the head lights would not flicker up and down as the sub woofer went "BOOM " "BOOM". 1 FARAD = 1,000,000 MF. Thanks in advance; Sam Ragland From: owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-server@matronics.com] On Behalf Of Herb Sent: Thursday, August 21, 2014 8:18 AM Subject: Re: Kolb-List: Re: Radio intercom Good capacitors are in every junk piece of electronics at the salvage yard...anything from 1000 mfd on up should work.. Computer, switching power supplies use 400 to 600 mfd in the first section of the supply...just past the full wave bridge...even those may be enough...two in parallel would double the capacity... frugal Herb.... On 08/21/2014 08:22 AM, Frank Goodnight wrote: After reading everything I could find about capacitors , it seems that a A/C capacitor can be used anywhere in place of a DC because it is non polarized. A DC cannot be used in a AC circuit or hooked up with reverse polarity or it will burn up. The only reason for a DC is that it is 1/2 the price of a AC. I don't know if this is fact or fiction. As I am having trouble finding a DC 22,000 mf would someone that is a little more knowledgable than me please tell me if a AC will help reduce the engine noise when I transmit. Frank G Fayetteville AR MK 3 Classic ULS Sent from my iPad On Aug 20, 2014, at 8:32 PM, B Young wrote: Another devise that can help is an inductor... a lot of car audio systems use them... home brew by wrapping a steel nail with the power wire and put it I am old film canister or small pill bottle. Or wrap the wire around a ferrite ring.... want belt and suspenders ,, use a smaller capacitor before and after the inductor. For the right size I'll have to look when I get home Boyd On Aug 20, 2014 6:46 PM, "Larry Cottrell" wrote: Its the large one, 20-25000, I can't remember and I have it cushioned and tie wrapped to the side of the cage. There are two screws on the top of the capacitor. One + one -. The hot wire going to the radio goes to the + and continues on to the radio. The - goes to the ground bar. The info that some one furnished earlier says the ground should go straight to the battery rather than to a common ground. I will have to change that as soon as I can. Larry On Wed, Aug 20, 2014 at 5:45 PM, George Bearden wrote: > Larry said; "I installed a large capacitor (per John Hauck) and it now transmits loud and clear. The only noise that I hear in it is the quiet click of the strobes" Hope mine sounds that good. That's incredible. I assume the capacitor is used as a by-pass, from hot to grnd? Do you recall the value? Sporty's SP-200 ICOM IC-A20 IC-A2 -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List FORUMS - _blank">http://forums.matronics.com b Site - -Matt Dralle, List Admin. target="_blank">http://www.matronics.com/contribution -- If you forward this email, or any part of it, please remove my email address before sending. get="_blank">http://www.matronics.com/Navigator?Kolb-List tp://forums.matronics.com _blank">http://www.matronics.com/contribution ========= ://www.matronics.com/Navigator?Kolb-List ========= cs.com ========= matronics.com/contribution ========= ________________________________ Message 8 _____________________________________ Time: 01:21:21 PM PST US From: Dennis Rowe Subject: Re: Kolb-List: Re: Radio intercom Different application there, the huge cap you used was to provide more curre nt for the Bass in your stereo, like a hydraulic accumulator. Here caps are u sed to short noise spikes to ground to clean up our 12 volt dc Dennis "Skid" Rowe Mk3, Rotax 670, Leechburg, PA > On Aug 21, 2014, at 3:18 PM, "Samuel Ragland" wrote : > > Dear fellow Kolbers > > I don't know much about capacitors but is bigger better? > Back in my car audio days we used "1 FARAD" capacitors.=C3=82 =C3=82 Thes e > held power in reserve so at night when you were driving, =C3=82 the head l ights > would not flicker up and down as the sub woofer went "BOOM " "BOOM". > 1 FARAD = 1,000,000 MF. > > Thanks in advance; > > Sam Ragland > From: owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-server@ matronics.com] On Behalf Of Herb > Sent: Thursday, August 21, 2014 8:18 AM > To: kolb-list@matronics.com > Subject: Re: Kolb-List: Re: Radio intercom > > Good capacitors are in every junk piece of electronics at the salvage yard ...anything from 1000 mfd on up should work.. Computer, switching power sup plies use 400 to 600 mfd in the first section of the supply...just past the f ull wave bridge...even those may be enough...two in parallel would double th e capacity... > > frugal Herb.... > > > On 08/21/2014 08:22 AM, Frank Goodnight wrote: > After reading everything I could find about capacitors , it seems that a A /C capacitor > can be used anywhere in place of a DC because it is non polarized. A DC ca nnot be > used in a AC circuit or hooked up with reverse polarity or it will burn up . The only reason > for a DC is that it is 1/2 the price of a AC. I don't know if this is fact or fiction. As I am > having trouble finding a DC 22,000 mf would someone that is a little more k nowledgable > than me please tell me if a AC will help reduce the engine noise when I tr ansmit. > Frank G > Fayetteville AR > MK 3 Classic ULS Sent from my iPad > > On Aug 20, 2014, at 8:32 PM, B Young wrote: > > Another devise that can help is an inductor... a lot of car audio systems use them... home brew by wrapping a steel nail with the power wire and put it I am old film canister or small pill bottle. Or wrap the wire around a f errite ring.... want belt and suspenders ,, use a smaller capacitor befor e and after the inductor. For the right size I'll have to look when I get home > Boyd > > On Aug 20, 2014 6:46 PM, "Larry Cottrell" wrote: > Its the large one, 20-25000, I can't remember and I have it cushioned and t ie wrapped to the side of the cage. There are two screws on the top of the c apacitor. One + one -. The hot wire going to the radio goes to the + and con tinues on to the radio. The - goes to the ground bar. The info that some one furnished earlier says the ground should go straight to the battery rather t han to a common ground. I will have to change that as soon as I can. > Larry > > > On Wed, Aug 20, 2014 at 5:45 PM, George Bearden wrot e: > > > Larry said; > "I installed a large capacitor (per John Hauck) and it now transmits loud > and clear. The only noise that I hear in it is the quiet click of the > strobes" > > Hope mine sounds that good. That's incredible. I assume the capacitor is > used as a by-pass, from hot to grnd? Do you recall the value? > > Sporty's SP-200 > ICOM IC-A20 > IC-A2 > > > > > ========== > -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List > ========== > FORUMS - > _blank">http://forums.matronics.com > ========== > b Site - > -Matt Dralle, List Admin. > target="_blank">http://www.matronics.com/contribution > ========== > > > > > > > -- > If you forward this email, or any part of it, please remove my email addre ss before sending. > > > get="_blank">http://www.matronics.com/Navigator?Kolb-List > tp://forums.matronics.com > _blank">http://www.matronics.com/contribution > > > > ========================= ========= > ://www.matronics.com/Navigator?Kolb-List > ========= > cs.com > ========================= ========= > matronics.com/contribution > ========= > > > > > > http://www.matronic================ > < =C3=82 =C3=82 =C3=82 - MATRONICS WEB FORUMS via the Web =C3=82 =C3=82 - -> http://forums.matronics.com=C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 - List Contribution Web generous =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 =C3=82 -Matt http://www.matronic s.com/c > > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > ________________________________ Message 9 _____________________________________ Time: 01:22:57 PM PST US From: Dennis Rowe Subject: Re: Kolb-List: Re: Radio intercom I got a 2200uf Mallory electrolytic cap today. Should be able to try it soon . Also discovered my patch cords were incorrect. Ordering right ones Dennis "Skid" Rowe Mk3, Rotax 670, Leechburg, PA > On Aug 21, 2014, at 10:18 AM, Herb wrote: > > Good capacitors are in every junk piece of electronics at the salvage y ard...anything from 1000 mfd on up should work.. Computer, switching power s upplies use 400 to 600 mfd in the first section of the supply...just past th e full wave bridge...even those may be enough...two in parallel would double the capacity... > > frugal Herb.... > > >> On 08/21/2014 08:22 AM, Frank Goodnight wrote: >> After reading everything I could find about capacitors , it seems that a A /C capacitor >> can be used anywhere in place of a DC because it is non polarized. A DC c annot be >> used in a AC circuit or hooked up with reverse polarity or it will burn u p. The only reason >> for a DC is that it is 1/2 the price of a AC. I don't know if this is fac t or fiction. As I am >> having trouble finding a DC 22,000 mf would someone that is a little more knowledgable >> than me please tell me if a AC will help reduce the engine noise when I t ransmit. >> Frank G >> Fayetteville AR >> MK 3 Classic ULS Sent from my iPad >> >> On Aug 20, 2014, at 8:32 PM, B Young wrote: >> >>> Another devise that can help is an inductor... a lot of car audio syste ms use them... home brew by wrapping a steel nail with the power wire and p ut it I am old film canister or small pill bottle. Or wrap the wire around a ferrite ring.... want belt and suspenders ,, use a smaller capacitor bef ore and after the inductor. For the right size I'll have to look when I g et home >>> Boyd >>> >>>> On Aug 20, 2014 6:46 PM, "Larry Cottrell" wro te: >>>> Its the large one, 20-25000, I can't remember and I have it cushioned a nd tie wrapped to the side of the cage. There are two screws on the top of t he capacitor. One + one -. The hot wire going to the radio goes to the + and continues on to the radio. The - goes to the ground bar. The info that some one furnished earlier says the ground should go straight to the battery rat her than to a common ground. I will have to change that as soon as I can. >>>> Larry >>>> >>>> >>>> On Wed, Aug 20, 2014 at 5:45 PM, George Bearden w rote: > >>>>> >>>>> > Larry said; >>>>> "I installed a large capacitor (per John Hauck) and it now transmits l oud >>>>> and clear. The only noise that I hear in it is the quiet click of the >>>>> strobes" >>>>> >>>>> Hope mine sounds that good. That's incredible. I assume the capacitor i s >>>>> used as a by-pass, from hot to grnd? Do you recall the value? >>>>> >>>>> Sporty's SP-200 >>>>> ICOM IC-A20 >>>>> IC-A2 >>>>> >>>>> >>>>> >>>>> >>>>> ========== >>>>> -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List >>>>> ========== >>>>> FORUMS - >>>>> _blank">http://forums.matronics.com >>>>> ========== >>>>> b Site - >>>>> -Matt Dralle, List Admin. >>>>> target="_blank">http://www.matronics.com/contribution >>>>> ========== >>>>> >>>>> >>>>> >>>> >>>> >>>> >>>> -- >>>> If you forward this email, or any part of it, please remove my email ad dress before sending. >>>> >>>> >>>> get="_blank">http://www.matronics.com/Navigator?Kolb-List >>>> tp://forums.matronics.com >>>> _blank">http://www.matronics.com/contribution >>>> >>> >>> >>> >>> ======================== >>> ://www.matronics.com/Navigator?Kolb-List >>> ======================== >>> cs.com >>> ======================== >>> matronics.com/contribution >>> ======================== >>> >> >> >> > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 10 ____________________________________ Time: 01:38:50 PM PST US From: "Samuel Ragland" Subject: RE: Kolb-List: Re: Radio intercom Thanks for the info! Sam Ragland From: owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-server@matronics.com] On Behalf Of Dennis Rowe Sent: Thursday, August 21, 2014 2:21 PM Subject: Re: Kolb-List: Re: Radio intercom Different application there, the huge cap you used was to provide more current for the Bass in your stereo, like a hydraulic accumulator. Here caps are used to short noise spikes to ground to clean up our 12 volt dc Dennis "Skid" Rowe Mk3, Rotax 670, Leechburg, PA On Aug 21, 2014, at 3:18 PM, "Samuel Ragland" wrote: Dear fellow Kolbers I don't know much about capacitors but is bigger better? Back in my car audio days we used "1 FARAD" capacitors.=C3=82 =C3=82 These held power in reserve so at night when you were driving, =C3=82 the head lights would not flicker up and down as the sub woofer went "BOOM " "BOOM". 1 FARAD = 1,000,000 MF. Thanks in advance; Sam Ragland From: owner-kolb-list-server@matronics.com [mailto:owner-kolb-list-server@matronics.com] On Behalf Of Herb Sent: Thursday, August 21, 2014 8:18 AM Subject: Re: Kolb-List: Re: Radio intercom Good capacitors are in every junk piece of electronics at the salvage yard...anything from 1000 mfd on up should work.. Computer, switching power supplies use 400 to 600 mfd in the first section of the supply...just past the full wave bridge...even those may be enough...two in parallel would double the capacity... frugal Herb.... On 08/21/2014 08:22 AM, Frank Goodnight wrote: After reading everything I could find about capacitors , it seems that a A/C capacitor can be used anywhere in place of a DC because it is non polarized. A DC cannot be used in a AC circuit or hooked up with reverse polarity or it will burn up. The only reason for a DC is that it is 1/2 the price of a AC. I don't know if this is fact or fiction. As I am having trouble finding a DC 22,000 mf would someone that is a little more knowledgable than me please tell me if a AC will help reduce the engine noise when I transmit. Frank G Fayetteville AR MK 3 Classic ULS Sent from my iPad On Aug 20, 2014, at 8:32 PM, B Young wrote: Another devise that can help is an inductor... a lot of car audio systems use them... home brew by wrapping a steel nail with the power wire and put it I am old film canister or small pill bottle. Or wrap the wire around a ferrite ring.... want belt and suspenders ,, use a smaller capacitor before and after the inductor. For the right size I'll have to look when I get home Boyd On Aug 20, 2014 6:46 PM, "Larry Cottrell" wrote: Its the large one, 20-25000, I can't remember and I have it cushioned and tie wrapped to the side of the cage. There are two screws on the top of the capacitor. One + one -. The hot wire going to the radio goes to the + and continues on to the radio. The - goes to the ground bar. The info that some one furnished earlier says the ground should go straight to the battery rather than to a common ground. I will have to change that as soon as I can. Larry On Wed, Aug 20, 2014 at 5:45 PM, George Bearden wrote: > Larry said; "I installed a large capacitor (per John Hauck) and it now transmits loud and clear. The only noise that I hear in it is the quiet click of the strobes" Hope mine sounds that good. That's incredible. I assume the capacitor is used as a by-pass, from hot to grnd? Do you recall the value? 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