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.
Found in a 1995 Hands-On Electronics, this circuit generates a sinusoidal signal whose frequency...
This circuit was obtained from Maxim documentation. The circuit has 4.5 and 5.5V thresholds for...
This basic voltmeter circuit has an input resistance of 2 M. The instrument is 100 uA and the...