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.
Based on an LM36000 OTA this circuit was found in the July 1988 issue of Radio Electronics...
The LED frequency flashes depends on the value of the capacitor tested according to the table. We...
The purpose of this circuit is to improve the dynamic range of ambient sound systems, preventing them...