We found this precision circuit in a manual from the 80's. The operational amplifier is of a common type at the time, and equivalents can be tested. Transistors are general purpose types.
This circuit was found in an American audio documentation from 1968. The configuration can be...
This converter uses an SG1524 integrated circuit, which is uncommon nowadays. The circuit is from...
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...