I was reminded that a simple 555 timer can create an astable oscillator that can be used with a DVM to measure a transformer windings when at a rally or when there are no markings.
The values for R1, R2 and C1 will give you the frequency and the duty (charge/discharge).
t1 = 0.693 (R1 + R2) x C
and
t2 = 0.693 x R2 x C
Where, R is in Ω's and C in Farads.
You might then follow that with a simple op amp integrator to turn the square wave into a sine wave.
Or another option without the op amp so a similar small component count is a saw toothed oscillator.
The frequency of the circuit is:
You might then follow that with a simple op amp integrator to turn the square wave into a sine wave.
Or another option without the op amp so a similar small component count is a saw toothed oscillator.
The frequency of the circuit is:
f = (Vcc-2.7)/(RxCXVpp)
Vcc is the supply voltage and Vpp is the Vpp of the output voltage.
The transistor can be almost any GP PNP.
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