Pulse Generator (CB24524E)

Using the 555 and 7400 this circuit was found in the September 1977 Radio Electronics magazine. The power supply must be made with a voltage of 5 V.

| Clique na imagem para ampliar |

Telephone Line Tester (CB21266E)
We found this circuit in a Radio Electronics from the 90s. The circuit is for conventional analog...
Microphone Micro Amplifier (CB19624E)
The operational of this amplifier can be the 741 and the resistors R1 and R3 are of 10 k. R2B is...
Sequential 4017 and Neon Lamp (CB10508E)
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...