This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular Electronics. The transistor must be according to the indicator or load being driven.
This circuit was obtained from an American 80's documentation. The balanced mixer can be shown in...
Found in a 90s Electronic Design, this circuit generates harmonics from a sinusoidal input signal....
Published in an old Popular Electronics, this circuit makes use of components that are still...