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    Simple medium wave radio circuit with variable diodes and TL081 linear operational amplifiers ----- TL081 RADIO

     

    Keywords: TL081 Conveyor Circuit Diagram The illustration is used as a tuning element to substituting a variable capacitor using a beam diode VD2. The capacitance can be changed by changing the voltage by the potentiometer RP1. Thus the purpose of tuning. After the tuning signal passes through the diode VD1, it is applied to the operational amplifier A1 having the field effect transistor input, and the output is connected to 400 to 2000Ω load (headphones, small speakers, or amplifier inputs, etc.). Adjusting the potentiometer RP2 changes the amplification coefficient to change the volume. Some component specifications: VD1: diode AA139 or similar device RP1: 47KΩ Wireback Potentiometer VD2: Visit Diode BB312 RP2 1MΩ Wire Wound Potentiometer A1: Operational amplifier TL 081

     

     

     

     

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