---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 04/17/10: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:03 PM - Designing a circuit question (Dennis & Anne Glaeser) 2. 05:12 PM - Re: Designing a circuit question (David) 3. 05:54 PM - Re: Designing a circuit question (Mike Welch) 4. 08:51 PM - Re: Designing a circuit question (Dennis & Anne Glaeser) 5. 09:00 PM - Re: Designing a circuit question (Dennis & Anne Glaeser) 6. 09:43 PM - Re: Re: Designing a circuit question (David) ________________________________ Message 1 _____________________________________ Time: 04:03:53 PM PST US From: "Dennis & Anne Glaeser" Subject: AeroElectric-List: Designing a circuit question I have an in flight adjustable IVO prop. What I'd like to have is a light that indicates when I get to the flat pitch 'stop' - without adding rings and brushes. For those who aren't familiar with the IVO, the adjustment is made by a motor driving a jack-screw that moves a collar which torques a rod embedded in the blades. There are no electrical stops, just a rubber washer at each end of the run. When the collar hits the end, the motor stalls. The rubber washer provides a softer stall which is a bit easier on the gears driving the jack screw. A 10A CB is the ultimate 'stop'. Not elegant, but it works. On the ground, before starting the engine, it's easy to verify the prop is in fine pitch by listening to the motor. The problem is before landing, when I'd like to have the prop in fine pitch, it has to be done by guess and feel, or just hold the switch until the CB pops - which is not a good thing to do on a regular basis. So, what I'd like is a circuit that can sense an amperage spike - going over 9A would be perfect - and turn on a light (LED of course :-) The ramp up to 9A is steep - goes from 5-6A to 9A very quickly (if that helps). I can build the circuit, I just don't know how to design it. Thanks in advance, Dennis Glaeser ________________________________ Message 2 _____________________________________ Time: 05:12:16 PM PST US From: David Subject: Re: AeroElectric-List: Designing a circuit question There is a little IC with three pins that you could put in circuit with the system. It tells you the amperage passing through it. IIRC it's about $6. I can look up the part number on the ones I have here somewhere... David M. Dennis & Anne Glaeser wrote: > > I have an in flight adjustable IVO prop. What Id like to have is a > light that indicates when I get to the flat pitch stop without > adding rings and brushes. > > For those who arent familiar with the IVO, the adjustment is made by > a motor driving a jack-screw that moves a collar which torques a rod > embedded in the blades. There are no electrical stops, just a rubber > washer at each end of the run. When the collar hits the end, the motor > stalls. The rubber washer provides a softer stall which is a bit > easier on the gears driving the jack screw. A 10A CB is the ultimate > stop. Not elegant, but it works. > > On the ground, before starting the engine, its easy to verify the > prop is in fine pitch by listening to the motor. The problem is before > landing, when Id like to have the prop in fine pitch, it has to be > done by guess and feel, or just hold the switch until the CB pops > which is not a good thing to do on a regular basis. > > So, what Id like is a circuit that can sense an amperage spike > going over 9A would be perfect and turn on a light (LED of course > :-) The ramp up to 9A is steep goes from 5-6A to 9A very quickly (if > that helps). > > I can build the circuit, I just dont know how to design it. > > Thanks in advance, > > Dennis Glaeser > > ________________________________ Message 3 _____________________________________ Time: 05:54:00 PM PST US From: Mike Welch Subject: RE: AeroElectric-List: Designing a circuit question Dennis=2C I have the exact same IvoProp setup. They make an option for this functi on=2C if I'm not mistaken. I just went to their website=2C and checked out what they had. They call it a prop speed govenor. Cost is $320. Yeah=2C I'd love to build one of these=2C too!! If anyone can come up wi th a design=2C I could build it!! Maybe there could be a line of LEDs that reflect the currect load in each direction of travel. Mike Welch From: glaesers@wideopenwest.com Subject: AeroElectric-List: Designing a circuit question I have an in flight adjustable IVO prop. What I=92d like to have is a ligh t that indicates when I get to the flat pitch =91stop=92 ' without adding rings and brushes. For those who aren=92t familiar with the IVO=2C the adjustment is made by a motor driving a jack-screw that moves a collar which torques a rod embedde d in the blades. There are no electrical stops=2C just a rubber washer at each end of the run. When the collar hits the end=2C the motor stalls. Th e rubber washer provides a softer stall which is a bit easier on the gears driving the jack screw. A 10A CB is the ultimate =91stop=92. Not elegant =2C but it works. On the ground=2C before starting the engine=2C it=92s easy to verify the pr op is in fine pitch by listening to the motor. The problem is before landi ng=2C when I=92d like to have the prop in fine pitch=2C it has to be done b y guess and feel=2C or just hold the switch until the CB pops ' which is not a good thing to do on a regular basis. So=2C what I=92d like is a circuit that can sense an amperage spike ' goi ng over 9A would be perfect ' and turn on a light (LED of course :-) The ramp up to 9A is steep ' goes from 5-6A to 9A very quickly (if that help s). I can build the circuit=2C I just don=92t know how to design it. Thanks in advance=2C Dennis Glaeser _________________________________________________________________ The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with H otmail. http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid= PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5 ________________________________ Message 4 _____________________________________ Time: 08:51:42 PM PST US From: "Dennis & Anne Glaeser" Subject: AeroElectric-List: RE: Designing a circuit question Mike, I've seen their speed governor on their website, but don't know how well it works. Making a decent speed controller is more involved and expensive than I want. All I really want is a 'limit sensor' for the pitch stops. Some IVO owners have installed an ammeter, which is an option but I'm hoping for something simpler - just a light. Dennis ---------- Mike Welch (mdnanwelch7@hotmail.com) Date: Sat Apr 17 - 5:54 PM Dennis I have the exact same IvoProp setup. They make an option for this function if I'm not mistaken. I just went to their website and checked out what they had. They call it a prop speed govenor. Cost is $320. Yeah I'd love to build one of these too!! If anyone can come up with a design I could build it!! Maybe there could be a line of LEDs that reflect the currect load in each direction of travel. Mike Welch ________________________________ Message 5 _____________________________________ Time: 09:00:38 PM PST US From: "Dennis & Anne Glaeser" Subject: AeroElectric-List: RE: Designing a circuit question David, Can the IC do any switching based on the amperage it senses? Dennis ------------------ From: David (ainut@hiwaay.net) There is a little IC with three pins that you could put in circuit with the system. It tells you the amperage passing through it. IIRC it's about $6. I can look up the part number on the ones I have here somewhere... David M. ________________________________ Message 6 _____________________________________ Time: 09:43:21 PM PST US From: David Subject: Re: AeroElectric-List: RE: Designing a circuit question Not this one. That would have to be another circuit. A $1 microprossesser could handle a $17 relay to do that job. David Dennis & Anne Glaeser wrote: > --> AeroElectric-List message posted by: "Dennis& Anne Glaeser" > > David, > > Can the IC do any switching based on the amperage it senses? > > Dennis > > ------------------ > From: David (ainut@hiwaay.net) > > There is a little IC with three pins that you could put in circuit with > the system. It tells you the amperage passing through it. IIRC it's > about $6. I can look up the part number on the ones I have here somewhere... > > David M. > > > ------------------------------------------------------------------------------------- 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.