B21126E)
This circuit was taken from an old Popular Electronics. The circuit can have its frequency changed from an external signal. The center frequency is given by C1.
This well-designed bistable configuration is for educational purposes. We found it in the...
This low power bass booster is from the 1977 National Semiconductor Audio Handbook. The circuit is...
This circuit, well known to our readers, only has a slightly different schematic representation, as it was...