Unijunction transistor sequential timer (CB21400E)

This circuit was found in Motorola documentation from 1968. Transistors can be modern equivalents, just like SCRs.

| Clique na imagem para ampliar |

Voltage Level Detector (CB4660E)
This circuit is intended to trigger an alarm when the input voltage exceeds one value and to...
13.8 V x 5 A Power Supply (CB1216E)
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
Ultra Narrow Band Pass Filter (CB4908E)
This circuit, obtained from the component manual used, has an ultra narrow 1 kHz range given by...