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The circuit in the figure below is an integrated circuit am radio containing all the active radio frequency circuitry within a single ic. The circuit is using only few components to make a good quality am receiver.
The circuit is designed around the ic zn414z which is a ten transistor tuned radio read more.
Am radio circuit diagram. On the other hand a circuit with narrow bandwidth suitable for audio is useful for selecting a station as explained next. It has 8 pins. As can be seen in the given circuit diagram the design is as simple as it can be just a couple of general purpose transistors and a few other passive components for configuring what looks like a nice little am radio receiver unit.
All general purpose transistors should work in this circuit you can use bc549 transistors for this circuit. Follows fcc regulations and still produces enough amplitude modulation. The schematic mentioned here is also a simple am radio circuit but it is not using a crystal it is using high gain preamplifier stage of transistor bc 549.
This is a low voltage audio power amplifier. A simple am transmitter circuit with diagram and schematic. This is the circuit diagram of the simplest single chip am radio.
Simple am radio receiver this circuit is essentially an amplified crystal set. First mass produced transistor radio 1954. The overall block diagram of most am radio receivers is detailed.
The transistor t1 works as a feedback regulated hf amplifier and. The inductor could be a standard am radio ferrite rod antenna while the tuning capacitor is a variable plastic dielectric gang intended for small am radios. It has an op amp internally which acts as an amplifier.
The non inverting pin is connected to the variable resistor of 10kohms. It uses only 2 transistors and few passive components which makes is very easy to be constructed. The fm radio circuit mainly consists of lm386 ic.
Inverting pin of the lm386 ic is connected to the ground. Although the circuit is very simple it functions very well without external antenna or ground connection. It is similar in principle to the zn414 radio ic which is now replaced by the mk484.
The circuit use a compact three transistor regenerative receiver with fixed feedback. A circuit with a narrower bandwidth than the range of audio say 1khz would attenuate or cut out the higher frequencies in audio and distort the output. The aerial tuned circuit feeds diode d1 which functions as the detector.
This two transistor am radio circuit is also called mini radio. For more crystal radio circuits simple one transistor radios and more advanced low transistor count radios. This is the circuit diagram of mini am radio receiver.
This am radio transmitter can transmit audiosound to your backyard. It operates at a supply voltage of 4 12 volts.
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