Double door bell (CB7559E)

Found in an Elektor from the 90's, this double door-bell drive circuit switches a relay by triggering different points.

| Clique na imagem para ampliar |

Synchronized automatic switch (CB9260E)
This control circuit up to 1 kW was found in a 1967 RCA documentation. The components are from...
Buffered Detector (CB6669E)
This circuit was found in 1967 General Electric documentation. The transistors of the time can be...
Rectangular generator with PLL 4046 (CB25752E)
This circuit produces signals in the range of 200 Hz to 2 kHz. We found it in the magazine...