This circuit is from an American manual from 1975. The transistors are types of the time, but equivalents can be used, as well as the relay that can be according to the supply voltage.
A safe way to obtain a sinusoidal signal of excellent quality and low frequency without the need...
This circuit can measure audio output power up to 50 W. The circuit is wired to the output of an...
We found this circuit in a publication from the 1970s, but it can still be assembled today by...