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Generators / Re: Solid State AVR on an ST-3 Head - Any need for it ?
« on: June 23, 2022, 02:28:34 AM »That may be OK, it looks like a modern one. A picture from the other side would help.
I'd order a new one to have on hand, in case it's crap. When your output voltage suddenly goes way low, that's the usual culpret (with Chinesium bridge diode).
Here's an example of what you want:
https://www.ebay.com/itm/224811975854?epid=25016784898&_trkparms=ispr%3D1&hash=item3457d684ae:g:LP0AAOSw07hh9D9b&amdata=enc%3AAQAGAAAA4DnkmsOqUD5Je7CXIp1vp20AWgEgoojiNCXA37jPM8BMpvjM1U4Yfupo7yaDHQ%2FWrT%2Fcg4npkrGOlp5z50wf8GCQFT68xqa89gdinHLtlG0vPIZUGluNz0ey9Ioc0pK3Egc8qiRPkpJjqCOqHKNYkftz9cvug0K4JLVudSv8c1EZzaWdRRSb8BoT9diH5euXC1Ihu0SFZuxvdHAKjrf9cCk4jDaSsDU2C8qjhiastbesKQfUKpD7COBS946hkpx6XRc%2FpBP24L9PhzmcE15wZsOrD8Tkccxa%2BJxCaq%2FUaYPc%7Ctkp%3ABFBMssOY95Vg
A bridge rectifier is just four diodes potted in a metal or plastic box. Two AC inputs, usually opposite corners, and two DC outputs, usually marked + (plus) and - (minus). It turns AC (from the harmonic winding on the stator, which is very spikey and non-sine, and turns it into pulsed (spikey) DC for the rotor. The rotor windings have a huge inductance, so they smooth the input current to create a more constant magnetic field at the 4 rotor poles.
For this application, the metal body is better for heat sinking to some aluminum. A die cast aluminum case to replace the doghouse comes to mind. Use some thermal paste or a dab of silicone caulk It should be as thin as it can be, to just increase the surface contact area.
Hey Bruce - thanks again. Just what I needed
See pics?
The very thing you left the email link to on EBay is available here on our TradeMe so cheap I bought two (one for a spare) and some heatsink compound. I have some finned alloy sections off of VSDs that'll make good heat-sinks
These little fellows just have a " + " for DC positive I guess - and guess also as you say that DC neg is diagonally opposite.
They also have " AC" and I guess, again, that the other AC is diagonally opposite. Do you think it matters which AC terminal is neutral and which is phase - or if it matters? And how to tell which is which - if it does matter?
Cheers