With this circuit you can produce the sound effect passing from one channel to another. The circuit is from Mullard documentation from the 1960s. The transistors may be the BC548.
Using the ULN-3784B this circuit typically supplies 5 W at 24 W. However, it can operate from 9 V....
This circuit, from a former publication of 1968 was originally designed for germanium transistors, but with the...
This circuit simulates an 18-point digital display using light bulbs, but can be adapted to use...