Precision Tone Switch 4046 (CB25256E)

Using a 4046 PLL this circuit recognizes a 1.6 to 1.8 kHz tone by driving an output LED. The circuit is from a Radio Electronics from December 1989.

| Clique na imagem para ampliar |

Odometer (CB6334E)
This 1970 Philips circuit uses a mechanical counter. The circuit is triggered by a reed switch...
Very Low Frequency Generator (CB4925E)
By the components used this circuit of old English documentation can still be easily assembled. The...
KMR 6 Keys Tactile SMT (COM035E)
It can be obtained from Mouser Electronics new tactile keys subminiature SMT KMR 6 Series C & K....