This circuit with a 4046 PLL was found in the December 1989 issue of Radio Electronics magazine. The circuit produces the clicks of a roulette wheel at decreasing speed.
This circuit was found in a 1969 Ferranti documentation. It can be implemented with modern...
This receiver uses germanium PNP transistors that can be used from old disused devices. The...
This circuit was found in November 1984 Radio Electronics magazine. The frequency is given by C1...