---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 06/15/11: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:57 AM - Re: Current advice on Battery charger/tenders? (Radioflyer) 2. 08:31 AM - Re: Re: Current advice on Battery charger/tenders? (Robert L. Nuckolls, III) 3. 04:43 PM - AEC 9009 Audio Amplifier Troubleshooting Questions (Jared Yates) 4. 05:33 PM - Photo FET Optocoupler (John Grosse) 5. 06:38 PM - Re: Photo FET Optocoupler (Daniel Hooper) 6. 07:49 PM - Re: AEC 9009 Audio Amplifier Troubleshooting Questions (Robert L. Nuckolls, III) 7. 07:57 PM - Re: Photo FET Optocoupler (Robert L. Nuckolls, III) 8. 08:00 PM - Re: Photo FET Optocoupler (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 06:57:23 AM PST US Subject: AeroElectric-List: Re: Current advice on Battery charger/tenders? From: "Radioflyer" Ok, I'll try out another shumacher. I just picked up the "Speed Charge" name from the shumacher website (SC series). I'll see what I find at wall mart or autozone. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=343040#343040 ________________________________ Message 2 _____________________________________ Time: 08:31:21 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Current advice on Battery charger/tenders? At 09:53 AM 6/15/2011, you wrote: > >Ok, I'll try out another shumacher. I just picked up the "Speed >Charge" name from the shumacher website (SC series). I'll see what I >find at wall mart or autozone. Aha! I guess I was out of the loop on Schumacher's advertising. Seems the whole line of Schumacher products bear the 'speed charge' label. I've uploaded some Schumacher user's manuals to the website at: http://aeroelectric.com/Mfgr_Data/Battery_Chargers/ Walmart offers several chargers in this line starting with the 1562 and moving up. I'll keep an eye open for your 1562 . . . it's got to be in that pile of stuff somewhere . . . Bob . . . ________________________________ Message 3 _____________________________________ Time: 04:43:04 PM PST US Subject: AeroElectric-List: AEC 9009 Audio Amplifier Troubleshooting Questions From: Jared Yates I just got to the point where I can test my home-made audio amplifier, but it isn't working yet, and I was hoping I might be able to get some help from those who have built the circuit before to help narrow down the troubleshooting. I wired it up, applied power, and it blew the 1A fuse. I looked everything over to be sure that I didn't have any obvious shorts and couldn't find any. Just to be sure that the rest of the wiring wasn't the problem, I removed all of the wires except for the power and ground, but it still blows the fuse. I went through each component and verified the placement of the ICs and resistors. I did notice that I had one capacitor backwards, number 127, 1uF capacitor. I reversed it but still didn't notice any difference. Is there an easy way to test a capacitor to see if it is still good? There isn't any physical damage to any of them. I replaced the fuse with my multimeter leads to try and measure how much current it was taking, but the meter read zero, so I turned off the switch after a second or so. After that test the 317 was warm, but not hot, and nothing seemed to be smoking. Here are some pictures of the board: http://jaredyates.com/temp/aec9009/P1010764.JPG http://jaredyates.com/temp/aec9009/P1010765.JPG http://jaredyates.com/temp/aec9009/P1010766.JPG http://jaredyates.com/temp/aec9009/P1010767.JPG I had to make some substitutions in the capacitor part numbers due to digikey stock changes, but the resistors and ICs are all per specs. Does anyone have any suggestions on what to check next? ________________________________ Message 4 _____________________________________ Time: 05:33:58 PM PST US From: John Grosse Subject: AeroElectric-List: Photo FET Optocoupler I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it to turn on a bulb that draws 28 mA. I can't find a suitable relay, but I was thinking that a photo FET optocoupler might work. The problem is that I have no experience with these, and although I understand how they work, I don't know how to find a particular one that will work with my application. Could anyone suggest a part number for me? It would be appreciated. John Grosse ________________________________ Message 5 _____________________________________ Time: 06:38:42 PM PST US Subject: Re: AeroElectric-List: Photo FET Optocoupler From: Daniel Hooper How about a radioshack 2N2222 BJT transistor? Feed your signal into a 2.2K resistor. Other side of 2.2K resistor goes into the transistor base (B) terminal. +12V (or 5V) power into the bulb bulb to the collector (C) of the transistor Emitter (E) of the transistor to ground You can give it a rough test using a 5v source (or 3 AA batteries for 4.5V) and a 470 Ohm resistor. Hope that helps! --Daniel On Jun 15, 2011, at 7:30 PM, John Grosse wrote: > > I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it to turn on a bulb that draws 28 mA. I can't find a suitable relay, but I was thinking that a photo FET optocoupler might work. The problem is that I have no experience with these, and although I understand how they work, I don't know how to find a particular one that will work with my application. Could anyone suggest a part number for me? It would be appreciated. > > John Grosse > > > > ________________________________ Message 6 _____________________________________ Time: 07:49:16 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: AEC 9009 Audio Amplifier Troubleshooting Questions At 07:39 PM 6/15/2011, you wrote: >I just got to the point where I can test my home-made audio >amplifier, but it isn't working yet, and I was hoping I might be >able to get some help from those who have built the circuit before >to help narrow down the troubleshooting. I wired it up, applied >power, and it blew the 1A fuse. I looked everything over to be sure >that I didn't have any obvious shorts and couldn't find any. Just >to be sure that the rest of the wiring wasn't the problem, I removed >all of the wires except for the power and ground, but it still blows >the fuse. I went through each component and verified the placement >of the ICs and resistors. I did notice that I had one capacitor >backwards, number 127, 1uF capacitor. I reversed it but still >didn't notice any difference. Is there an easy way to test a >capacitor to see if it is still good? There isn't any physical >damage to any of them. Hmmm . . . I wish I had called out sockets under the amplifiers so that the builder can power it up with the ic's out. Capacitor size is not terribly critical but polarity is. MOST of the times you get a hot LM317 is for a reversed capacitor C122. Do an ohmmeter test from pin 6 to ground on either of the two amplifier chips. It should be non-zero. Actual measurement depends on your ohmmeter and polarity of the ohmmeter connections. The main thing is that it should be some substantial number showing that the path is not shorted. >I replaced the fuse with my multimeter leads to try and measure how >much current it was taking, but the meter read zero, so I turned off >the switch after a second or so. After that test the 317 was warm, >but not hot, and nothing seemed to be smoking. When powered up, you should have just under 9v on pin 6 of the two amplifiers. I don't know how you heat up the LM317 with zero current. Check the measurement setup. Bob . . . ________________________________ Message 7 _____________________________________ Time: 07:57:01 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Photo FET Optocoupler At 08:30 PM 6/15/2011, you wrote: > >I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it >to turn on a bulb that draws 28 mA. I can't find a suitable relay, >but I was thinking that a photo FET optocoupler might work. The >problem is that I have no experience with these, and although I >understand how they work, I don't know how to find a particular one >that will work with my application. Could anyone suggest a part >number for me? It would be appreciated. Doesn't need to be a photo-fet. There are plenty of LED couplers that would work. Is the 5v output measured with respect to ground . . . and does it go to zero volts in the off state? Can you turn the bulb on by pulling its control lead to ground? 28 mA lamp sounds like an LED, no? Emacs! Bob . . . ________________________________ Message 8 _____________________________________ Time: 08:00:53 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Photo FET Optocoupler At 08:30 PM 6/15/2011, you wrote: > >I have a pressure gauge that outputs a 5 VDC 10 mA signal. I need it >to turn on a bulb that draws 28 mA. I can't find a suitable relay, >but I was thinking that a photo FET optocoupler might work. The >problem is that I have no experience with these, and although I >understand how they work, I don't know how to find a particular one >that will work with my application. Could anyone suggest a part >number for me? It would be appreciated. Doesn't need to be a photo-fet. There are plenty of LED couplers that would work. Is the 5v output measured with respect to ground . . . and does it go to zero volts in the off state? Can you turn the bulb on by pulling its control lead to ground? 28 mA lamp sounds like an LED, no? Emacs! OOPS! You said pressure gage? Is this output a linear voltage that represents pressure or some voltage that is zero some times and 5v other times? Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.