This circuit is from a 1968 Electronic Design. The characteristics of the output transformer are not given and the transistors are of the time. The circuit provides a power of a few watts.
We obtained this circuit in a Maxim documentation from the 90s. The circuit is based on the...
This indicator or VU meter for stereo amplifiers was found in a 90s Radio Electronics. The...
This circuit was found in 1967 General Electric documentation. The transistors of the time can be...