This circuit from a Popular Electronics from the 90's can generate signals from 0.03 Hz to 3 kHz depending on the value of the capacitor and resistor.
This circuit is from old documentation, which means that the operational used is not easy to...
Two tone siren (CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be...
Based on Texas Instruments documentation, this circuit is based on the BQ2000 a circuit used to...