Infrared detector (CB7814E)

This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits equivalent and the phototransistor can be of any type.

| Clique na imagem para ampliar |

130 to 225 MHz Prescaler (CB23596E)
This circuit can be used in PLL, frequency synthesizer in FM and VHF receivers, reducing a...
170 degree phase shifter (CB8158E)
Found in an American circuit manual from the 1970s, this circuit can use any general-purpose transistor....
Low noise 5V source (CB21170E)
This power supply was obtained from an Electronic Design from the 90's. The circuit applies to...