Second Order Voice Filter (CB6544E)

Found on an 80's Radio Electronics, this circuit is designed to pass the 300 to 34,000 Hz voice range using standard operational amplifiers.

| Clique na imagem para ampliar |

One Transistor MW Radio (CB13182E)
This traditional direct amplification MW radio configuration was obtained in an American...
Servo Test (CB202E)
Servo motors operate from the changes in the pulse width in a range between 1 and 2 ms. The...
432MHz Doubler (CB4676E)
This circuit was found in an ancient American documentation. With it is possible to double the...