This circuit was found in a 1971s English magazine. We can still assemble it using BC548 transistor. The other components are common. The supply voltage of 6 or 12 V depends only on the relay.
We found this circuit in an old English publication. Transistors are general purpose and the block...
The circuit shown in the figure is suggested by Texas Instruments in its Linear Circuits...
This conventional oscillator with the 741 can be precisely adjusted to produce a 400 Hz signal. The...