This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all components are common. The transformer is 12 + 12 V with at least 1 A and the diodes 1N4002.
This circuit is indicated for measurement bridges as a null detector, thanks to the logarithmic gain...
This circuit, of a Popular Electronics of 1969 is destined to firing a gas LASER of the time. The...
This bass booster preamp is from an English publication (1966). We can mount it with more modern...