IR remote control emitter (CB7020E)

This circuit was found in 1980's Radio Electronics. The circuit produces a 1500 Hz modulate 35 kHz. The components used are still common.

| Clique na imagem para ampliar |

Proximity Detector (CB11566E)
This circuit is from a 1965 Argentine publication (Radio Chassis Television). The original...
Solar activity detector (CB23584E)
Very rapid brightness changes or flares that occur on the sun can be detected with this circuit that...
High Pass Filter II (CB19679E)
The components of this filter are calculated using conventional formulas (see mathematics section of...