Scale Expander for 12V Meter (CB21330E)

This circuit was found in a QST from the 1990s. The circuit expands the scale of a 10V instrument to measure 20V.

Radiolocation antenna (CB6531E)
This antenna for the frequencies 146 or 440 MHz was found in a magazine 73 for Amateur Radio of...
1 kHz Astable Using the 4070 (CB252E)
This circuit produces 1 kHz square signals using the CMOS IC 4070. The frequency is given by the...
Space sound generator (CB8443E)
Found in a 90s PE Hobbyst Handbook, this circuit mimics the sound of a space gun. The components...