Advertisement
Ceramic Filter Beat Frequency Oscillator – Circuit Schematic
Ceramic Filter Beat Frequency Oscillator
BFO is a simple device which helps us to listen SSB and CW transmissions. Reception of SSB and CW signals requires a product detector or BFO (Beat Frequency Osc...
Automatic Retransmitting Makeshift Repeater – Circuit Schematic
Automatic Retransmitting Makeshift Repeater
This circuit will be of interest to the radio amateur and anyone posessing two radios, (one of which must be able to transmit i.e. a transceiver). It is a self ...
AM DSB TRANSMITTER FOR HAMS – Circuit Schematic
AM DSB TRANSMITTER FOR HAMS
The circuit of AM transmitter is designed to transmit (amplitude modulated) DSB (double side band) signals. A modulated AM signal consists of a carrier and two ...
A 40 meter QRP - Transceiver – Circuit Schematic
A 40 meter QRP - Transceiver
This was one of my very first transceiver developments. This page was also one of the very first circuit descriptions that I put on the internet quite some year...
40m TRANSMITTER – Circuit Schematic
40m TRANSMITTER
This is a 40 meter transmitter which uses two valves, the 6AU6 and 6GV8. The construction is easy. Just be carefull due to high voltage present....
1.5v tracking transmitter – Circuit Schematic
1.5v tracking transmitter
The circuit is a common form used in FM transmitters. The transistor conducts for 60-90 electrical degrees. When it turns off the LC tank `rings`, completing th...
Lowpass filter uses only two values – Circuit Schematic
Lowpass filter uses only two values
The composite lowpass filter uses interior constant-k full sections terminated by m-derived half-sections.The design technique is also applicable to highpass an...
Bandpass Filter – Circuit Schematic
Bandpass Filter
This circuit is taken from the Progressive Communications Receiver in most of the recent ARRL Handbooks. Values for the 40 meter band are shown. If you want the...