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Ok, so here's the latest. I purchased a couple of the TI tachometer chips that PeterD suggested. I got one hooked up on a bench and got it to drive the HZ gage from an MEP-002A running in essence off utility power using an AC and a DC power adapter. Now the next step is to build a circuit to...

Latest update.... I'm abandoning the circuit I was playing with and have ordered a few of the LM2917 chips. The other circuit will drive the meter at 60Hz but is not giving me any movement on the needle as the frequency changes, no matter what I use for resistors and potentiometers. The only...

Peter, thank you for the info, I'll take a look those IC's today. Meanwhile, I tried the other circuit on the generator Friday night but found (as I suspected ) that a 4 Hz change at the generator only registered as about 1 Hz change on the meter (the circuit showed a 100uA meter instead of our...

So, the other day I hollowed out one of my dead transducer bodies ( found a bunch of stuff buried inside the potting material ) looks like it had not only a circuit board, but also a transformer or coil and a pair of caps about the diameter of a AA battery down the bottom. I made another board...

This morning I threw together a test board using the schematic I posted Friday and it worked... sort of.... The 5K potentiometer is way too big and sensitive. I ended up needing about 30 ohms at 60hz so I replaced it with a 200 ohm pot that I found and it works great so far, just sitting on a...

Looks very familiar.... I have the same gage on one of my units too. I had cut out an adapter plate and mounted it in place of the analog gage. I recently lost yet another transducer on my other machine and was interested in a way to drive the original gage,( just for authenticity) and have a...

A quick Google search turned up this circuit design for a frequency meter. Being that the MEP's use 200uA gauges, could this circuit be modified ( possibly by changing the resistor value ) to work correctly with the OEM gauge?

Here is a similar thread from a couple weeks ago talking about the transducers and meters. I know next to nothing about electronics, but, just like it was mentioned in this other thread, it would be fantastic if one of the electronics guru's on this site could come up with a simple, innexpensive...