5 LED Log Scale with U257B (CB25442E)

The circuit was found in the February 1992 Radio Electronics magazine. The scale can be changed by changing R2 and R3.

1.78 MHz Telephone Transmitter (CB16689E)
This 1992 circuit operates in the range of cordless phones used at the time. The circuit is based...
Fluorescent Flasher (CB17350E)
This different circuit uses a relay as an oscillator, whose frequency is determined by C1, and to...
Antenna Amplifier (CB3869E)
This antenna or booster amplifier operates with signals from the midband (MW) range up to the VHF...