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.
This instrument was obtained in a documentation for radio amateurs of 1976. The circuit measures...
This circuit was found in a computer publication from the 1970s. The transistors can be the BD135...
September, 2017 - Mean Well DC-DC regulators from 10 to 30 W are already available on Mouser...