Telephone Line Monitor (CB25983E)

This analog telephone line extension circuit monitors when the line is in use. We found it in the November 1996 Electronics Now magazine.

| Clique na imagem para ampliar |

Millivoltmeter with Operational (CB11551E)
In the figure we have the circuit of a millivoltmeter with operational Amplifier using a TLC271...
3-Transistors Radio (CB18417E)
This receiver was found in a Japanese publication in 1967. The circuit uses germanium transistors and...
Shooting in the Dark (CB3843E)
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...