Receivers

136 kHz direct conversion receiver
136 kHz direct conversion receiver
December 8, 2010

A simple direct conversion receiver [more]

MK484 Radio with Loudspeaker
MK484 Radio with Loudspeaker
December 8, 2010

A complete AM radio set based on the MK484 IC (formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker. [more]

SW Regenerative Receiver
SW Regenerative Receiver
December 8, 2010

The schematic diagram of an improved version of the early receiver. It will tune signals from 3500kHz up to 26MHz, roughly in three bands, each with a 1.96:1 frequency-ratio [more]

Bipolar Regenerative Receiver
Bipolar Regenerative Receiver
December 8, 2010

A bipolar regenerative design can be made to work efficiently. The major concern is the low input impedance of the detector-amplifier bipolar stage. Nevertheless, it can be easily compensated with positive feedback or regeneration [more]

FM Receiver
FM Receiver
December 8, 2010

An FM regenerative receiver using a single FET and one audio amplifier IC. [more]

Bug Detector
Bug Detector
December 8, 2010

This circuit can be used to "sweep" an area or room and will indicate if a surveillance device is operative [more]

SW Receiver Using ZN414
SW Receiver Using ZN414
December 6, 2010

A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands. [more]

ZN414 Portable Receiver
ZN414 Portable Receiver
December 6, 2010

An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout. [more]

AM Receiver
AM Receiver
December 6, 2010

This is a compact three transistor, regenerative receiver with fixed feedback. It is similar in principle to the ZN414 radio IC which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good. [more]