This circuit for the car was found in the April 1990 Radio Electronics magazine. The speaker is 4-ohms.
This 3 + 3 V symmetrical source circuit uses an old operational amplifier. The circuit is from an...
This antenna preamplifier can work with signals from about 20 MHz to 100 MHz, depending only on...
This circuit was published in a 1979 magazine, but it can still be easily assembled, as the...