Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

| Clique na imagem para ampliar |

Current Amplifier (CB6136E)
This circuit was found in a British documentation from 1969. It can be implemented with modern...
Voltage Controlled Oscillator (VCO) (CIR103E)
A simple VCO using two inverters in a ring configuration is shown here. A VCO is a circuit in...
Complementary Tourch Switch (CB3852E)
The four gates of a 40111 IC are used in thes two-out circuit. The output chages their state in a...