Long times with DI3T1 (CB21422E)

This PUT circuit was found in a 1967 General Electric SCR manual. The basic component is unusual, and the capacitor must be low-leakage.

| Clique na imagem para ampliar |

Micro metronome (CB20743E)
This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light...
27 MHz receiver (CB19446E)
This receiver was obtained in a documentation from the 90's and is of the super-regenerative type....
Switching amplifier (CB9001E)
We found this circuit in an old American documentation. The circuit applies to modern equivalent...