AFSK Tone Generator (CB4201E)

We find this encoding circuit in an American 1980s amateur radio documentation. The circuit can be implemented with equivalent modern components.

| Clique na imagem para ampliar |

Photodiode Amplifier (CB4950E)
This circuit is from an 80's component manual. The components are from the time, but the circuit...
Alternating Flash 555 (CB25533E)
This circuit was found in the November 1992 Radio Electronics magazine. The resistor in series with...
1 A Fixed Poweer (CB13066E)
Voltage regulators from 5 to 15 V for currents of 1 A, can be easily obtained in the form of...