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Schematic diagram for a broadband QRP SWR metering circuit and SSB TRANSCEIVER 80M / 40M boster filter IF Radio

A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light.

5 BAND Audio GRAPHIC EQUALIZER

5 BAND Audio GRAPHIC EQUALIZER AMPLIFIER using KA2223 5 BAND Audio GRAPHIC EQUALIZER AMPLIFIER using KA2223 The KA2223 is a monolithic integrated circuit consisting of an operational amplifier with five resonant circuits and a active filter, an it is suitable for radio-cassette tape recorders, car stereos or music center audio systems. FEATURES Tone control with […]

Circuit Test Equipment

Circuit Test Equipment using LM6462, 2N7000

Reader circuit

Simple Magnetic stripe reader circuit using CVBC337, BD139 Simple Magnetic stripe reader circuit using CVBC337, BD139 R1 68K 1/4W Resistor C1 4n7 630V Ceramic or Polyester Capacitor C2 60-80pF 63V Ceramic Trimmer C3 100F 25V Electrolytic Capacitor Q1 BC337 45V 800mA NPN Transistor Q2 BD139 80V 1.5A NPN Transistor L1 500 turns on a 10mm. […]

Audio mixing equipment

Audio mixing equipment Audio mixing equipment with NE5534 Audio mixing equipment Audio mixing equipment

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