1 W amplifier (CB8948E)

This circuit was obtained in a 90s American documentation. The integrated circuit used is uncommon today. The circuit has a low RFI level.

| Clique na imagem para ampliar |

Telegraphic Oscillator with Visual Indication (CB16279E)
This oscillator for the practice of telegraphy provides a good sound in a loudspeaker, with only...
40 kHz repellent (CB20815E)
This ultrasonic insect repellent was found in American documentation from the 1980s. The...
Experimental Telegraph LM3909 (CB14287E)
The short-wired circuit is suggested by National Semiconductor in documentation on the LM3909. The power...