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I just did a breadboard test of circuit #1 with the 2907. I used the 1000pF cap.
The results were very similar to those from my previous TTL circuit.
On my test bench setup, the pulse rate reported from the arduino USB port tracked the sine wave frequency exactly 1:1 until 189 hz. At that point the arduino pulse rate would go no higher. And when the sine wave frequency passed 283 hz, the arduino pulse rate started to decrease.
This is a tiny breadboard with fairly short leads.
Any suggestions?
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