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Posts tagged broadband

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.

Switching driver Circuit

Switching driver Circuit using 2N2222, Relay, LDR

Radio fm digital

Radio fm digital IC1 TDA7000 IC2 LM7805 LM386 D1BB329, BB105 Radio fm digital IC1 TDA7000 IC2 LM7805 LM386 D1BB329, BB105 R1 47K R2 22K R3 100K R4 39K R5 10 R6,12 7,5K – Optionally R13-r21 15K – Optionally P1 10K Logarithmic potentiometer P2 100K Linear potentiometer C1 39pF Ceramic C2 47pF Ceramic C3 2,2nF Polyester […]

Circuit diagram in making incandescent lamps

Circuit diagram in making incandescent lamps This simple circuit that can be used to flash incandescent lamps up to 10W power rating. The circuit is ideal for making flashing beacons on automobiles and other applications like that.The circuit is nothing but  an astable multi vibrator based on Q1&Q2 ( BC557&BD139).The capacitor C1 is the main […]

How can I make an AM wireless microphone? Can you suggest a website to find such schematic diagram for that?

sliderx13 asked: Our instructor in Electronics engineering gave us a project, that is, to make a wireless microphone that will transmit in AM bandwidth. Because this is our first design project, I don’t know where to start. I even search the web for schematic diagrams for an AM wireless mike, but I couldn’t find any, […]

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