“Toothpick” Audio CW Filter Kit
- Variable bandpass helps peak desired signal
- Audio amplifier will drive speaker to room filling volume
- In / out switch
- Use with phones or speaker
- Will work with other qrp rigs and older receivers
- Measured peak bandpass 700 to 1000 Hertz
Introduction:
The “toothpick” is a simple variable bandpass audio filter designed to compliment the “Splinter” QRPp Trans-Receiver. The filter also contains an audio amplifier which can produce room-filling volume when used with an external speaker. When used with the “Splinter” the filter has the added bonus of amplifying the sidetone oscillator during transmit. Although the design is simple and physically similar to the “Splinter” there is no reason that the “Toothpick” could not be used with other simple or vintage receivers needing a little extra audio filtering.
Price: $24.95 USD