Found in American documentation from the 90's, this circuit oscillates up to 150 MHz. The transistor supports an equivalent and the diode is general-purpose.
This relay shield was found in the October 1993 Electronics Now magazine. The circuit is powered by...
In the figure we have the basic configuration of a regulator for 12 V x 1 A suggested by Motorola in...
This circuit can be used as part of a Vox project or as an input shield for a microcontroller that...