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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.

Constant high current regulator – circuit modules

Constant high current regulator – circuit modules using BD140, 555, 3041, BC546, 4060 Constant-Voltage Constant-Current Battery Charger – BD140, 555, 3041, BC546, 4060

5V Power supply control

5V Power supply control using 74HCT688 5V Power supply control Circuit diagram Our control products offer our customers choices to meet their specific cost, Supply Current mA Typical 12V and 5V Power Supply

5W Audio Amplifier Circuit using TA7252P

5W Audio Amplifier Circuit using TA7252P

Practical Application – Intercom Circuit

The simple switch shown so far can be used in simple audio applications. Here is a simple “all-master” intercom circuit that steers an audio amplifier towards one of several distant receivers. All units shown are identical and are connected to the same multipair cable. One battery powers all units. You press the button corresponding to […]

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