This circuit shows how to make an adaptation on an AM receiver to receive CW and SSB signals. The circuit is from an 80's documentation. The diode is commonly used.
The operational amplifier used in this circuit is a low voltage type from Texas Instruments, being...
This circuit with different colored indicator LEDs has an expanded scale. We found it in the March...
This circuit can be supplied with voltages of 6 or 12 V, depending on the relay. The transistor can be...