Am Radio Receiver Circuit. Capturing unwanted am radio signals. You can easily get these components from an old radio.
The transistors q1 and q2 are wired as a compound transistor pair in which q1 is an emitter follower and q2 is a common emitter amplifier. Inductor l1 is used as a broadcast loopstick antenna coil whereas capacitor c1 is set for tuning. The emitter follower prevents the loading of tank circuit while the common emitter amplifier necessary voltage gain.
The circuit displayed below is a tunable am signal trap circuit which can be controlled to retrieve unwanted am signals and channel the remainder to the receiver.
It uses only 2 transistors and few passive components which makes is very easy to be constructed. The circuit displayed below is a tunable am signal trap circuit which can be controlled to retrieve unwanted am signals and channel the remainder to the receiver. The circuit use a compact three transistor regenerative receiver with fixed feedback. Although the circuit is very simple it functions very well without external antenna or ground connection.
