Circuit with space mark 555 (CB24845E)

Found in September 1984 Radio Electronics issue this circuit has adjustable pulse width and interval. The circuit has the base frequency given by C1.

Triac 0 to 30 V power supply (CB18509E)
This adjustable direct current source circuit uses a triac operating as a variac. The circuit is...
Crystal Calibrator (CB3893E)
With the precision given by the crystal this circuit provides signals of several frequencies for the...
Amplifier For Magnetic Phonocaptor (CB9514E)
This amplifier allows you to recover recorded tapes from a tape player that has the mechanism in...