Continuity tester (CB7386E)

This circuit was found in a Hands-On Electronics from the 90's. The FET can be any general purpose.

| Clique na imagem para ampliar |

AC SCR photo control (CB8313E)
Found in Philips' 1967 documentation, this circuit makes use of period components. The SCR can be...
65 V x 1 A power supply LM143 (CB14273E)
The LM143 is a high voltage operational amplifier not very easy to obtain today. The transistors used are...
7-segment LCD driver (CB7556E)
Found in American documentation from the 90s, this circuit uses TTL technology and is therefore...