AM receiver using ZN414

  
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This is the circuit diagram of the simplest single chip AM radio. The circuit is designed around the IC ZN414Z which is a ten transistor tuned radio frequency receiver. The IC has only three leads and is available in the TO92 package. All necessary circuits required for an AM receiver (RF amplifier, detector and AGC are incorporated inside the IC)
AM receiver using ZN414 - schematic

. In the circuit given below, capacitor C1 and resistor R1 forms the tank circuit which is essential for tuning. Capacitor C4 decouples DC from the output of the IC and C1 bye-passes the noise. Transistor Q1 and associated components forms a classic driver stage for the headphone. Head phone is connected across the resistor R5 and R4 gives necessary biasing for the transistor Q1. Just like in your Am receiver circuit, where you used a speaker as your out put. How do i replace that speaker with a relay so that i can you the circuit for another purpose EstarGĀ­a muy agradecido de ustedes si me hicieran el grande favor de informarme donde puedo conseguir en Colombia el Circuito Integrado: zn414z, quien lo distribuye, o en donde puedo encontrar esta informaciGĀ²n, ya que estoy interezado en este circuito. Typing ZN414 radio or MK484 even TA7642 IC One can easily reach a source to buy two of above latter one`s via Google. Visiting my homepage and links list reflected on related pages above will direct You to a reliable eBay source that provides TA7642 at a very very reasonable cost. As already mentioned the receiver covers the AM/Medium Wave and LW Long Wave only. Although some try the Short Waves/SW possibly the 49 meter band. As the IC has a top working frequency of 3 MHz. Tha above or similar circuits will work fine with different number of turns according to the variable capacitor value. The coil can be prepared at home need...



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