This circuit was found in the July 1994 issue of Electronics Now magazine. The relay can be rated at up to 12 V and 100 mA. The transistor is a general purpose transistor.
I found this circuit in Popular Electronics in July 1991. It generates an accurate 100 kHz signal,...
The circuit shown in the figure is suggested by Texas Instruments in its Linear Circuits...
This amplifier for sound equipment was found in the Philips Databook of 1990. The circuit can be...