This balance indicator for stereo amplifiers was found in an 80's Elektor. The components used are common. Zeners are 1.8 V or close to that value.
We find this automatic battery charger in an 80s ON Semiconductor circuit and application manual. Bridge...
We found this automotive alarm circuit in a 90's Popular Electronics circuit. The circuit emits a...
This configuration was found in a 1978 technical documentation. What the circuit does is convert an...