Infrared tone transmitter (CB20977E)

This simple very low power circuit can be used in a battery powered infrared tone trigger. We found it in an American documentation from the 90s.

| Clique na imagem para ampliar |

Adjustable Active Cycle Oscillator 555 CMOS (CB15863E)
To obtain a signal with a variable mark / space ratio in a ratio of 1 to 20 to 20 to 1, we have...
TTL Astable 7400 (CB19416E)
This traditional stable configuration with the TTL 7400 integrated circuit was obtained in a...
Two Light Flashers (CB947E)
The circuits below were found in amarican publication of the year 1958. The transistors are...