WB9YBM Analog Audio Oscillator:
QST,
February 2017, pages 46-47 —
This
circuit is not a kit (yet)... I constructed it first on a
breadboard and then transferred it to a generic PCB (the leftover half
of a board that I’d
cut in two
for the N4YG oscillator modifications). It was fortunate to
have tested
the circuit on a breadboard first, as the diagram in the QST
article misidentifies the output of the 741 op. amp. chip as pin 5.
It is
pin
6. Upon correcting this error, the breadboard circuit
functioned
as described in the article. However, I prefer a lower
frequency
tone, so tried a few combinations of R1, R2, and C2 + C3.
Then I had the idea to connect R1, R2, and the capacitor to an 8-pin
header that could be unplugged and swapped if desired, a poor man’s
tone control.
Another sort of crazy reason for doing this is that I did not have any
8-pin dip sockets at the time, and thought it would be a good way to fill up the
empty half of a 16-pin socket for the 741. The RC values in
the
photo are 0.1 µF for C2 + C3 and R1 = R2 = 10K.
Analog Oscillator: WB9YBM_oscillator.mp4
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