This circuit was found in a Ferranti documentation from 1969. The transistors are common types of the company at the time. Smaller equivalents may be used. The output power is of the order of 150 mW.
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...