I'm finally here, i solved the circuit by testing it, the problem i've now is you told me that the left ? could be a capacitor, but testing with the ohmeter i received a 200K value, so could it be just a resistor? Same thing with the right ? that gave me a 100K value instead..
Sir mosfet66 . . . . . .
I tell you whuts . . . . .since your fotie-grafs definition/focus was being somewhat less than perfect on the reeee-sis-tom-er-fers marked values.
But . . .HEY . . .I CAN make out the series drive resistor to the Mosfet gate as being 1 K.
However . . . . . . since YOU are able to see ALL of its parts . .you will be able to fill us in..
This would be the first stage towards generating a schematic for your circuitry . . . . .
Get an ohmmeter and check out Zero ohm paths of the "hidden" foil paths under the LM324 of the red circled points.
The Red Star looks like it connects to pin 7, but does it connect to any other LM324 pin also ?
Plus also check every pin of the LM324 to see if there also might also be OTHER hidden interconnects to other pins on it, to be sure.
Seeing my yellow arrows and the fact that the output of an LM324 op amp OUTPUT section is being directly connected to its NON INVERTING input,
with pins 8 to 9 tells me that particular section is being used for a voltage referencing or halving function.
The left mystery ceramic ? capacitor is probably used as a summing function and is up in the 10-47 nf range and is VERY likely unmarked.
While the right ? is probably the frequency determining C portion of a R/C oscillator and you just might find its value marked on its other hidden side.
(Or that COULD possibly be a like film reee-sistor, that just got mounted upside down ? )
You seem to have the speed pot connected with 4 wires, do I have it correct, with one wire possibly being a redundant connection ?
Plus, with it having trim resistors on either end of it, is suggestive of an optimally "sweet spot adjustment range".
Give some feedback on that requested info . . . . .
Your reference . . . . . . .Marked up:
73's de Edd
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