This circuit is from a Radio Electronics from October 1963. The transistor is a power transistor of the time, and two transformers are used. The input has 10k impedance and is powered by 12 V.
This biestable vox circuit was found in an old documentation. The circuit makes use of components of...
This circuit generates a triangular signal whose frequency is given by the basic components. The...
The LED is optically coupled to the LDR1 sensor to provide negative feedback to the circuit and...