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.
Posts tagged metering
Dual Pre-power Amplifier, volume controller and DC motor
Dual Pre-power Amplifier, volume controller and DC motor speed controller circuit using KA22136 Dual Pre-power Amplifier, volume controller and DC motor speed controller circuit using KA22136
Audio transistor amplifier circuit
Audio transistor amplifier circuit This is Audio transistor amplifier circuit diagram using 2N2222 of a simple 1 transistor audio amplifier that can deliver around 100mW An audio amplifier is an electronic amplifier that amplifies low-power audio signals
3 channel microphone circuit
3 channel microphone circuit using BC550C, BC547, BC557 P1,P2,P3______5K R1,R11,R15____180K 1/4W R2,R12,R16____2M2 1/4W R3,R13,R17____750R 1/4W R4,R14,R18____1K 1/4W R5____________15K 1/4W R6____________220R 1/4W R7____________1K5 1/4W R8____________820R 1/4W R9____________150R 1/4W R10___________100K 1/4W C1,C6,C8______1µF C2,C4,C7,C9___100µF C3,C5_________220µF Q1,Q4,Q5______ BC550C Q2____________ BC547 Q3____________ BC557
Computer Monitor Repair
Computer Monitor Repair LA7830 for Computer Monitor Repair and Color TV Vertical Deflection Output Circuit diagram Color TV and Monitor Vertical Deflection Output Circuit using LA7830
