This small transmitter appeared in the March 1989 issue of Radio Electronics magazine. The two-transistor circuit used an electret microphone and had a range of a few dozen meters.
We found this circuit in a 1967 RCA SCR manual. The circuit uses components from the era. The...
This high-gain digital amplifier uses general-purpose transistors. The supply voltage is logic...
This circuit uses two sensors that are placed at the intersection of a miniature railway, causing...