AM Receiver - 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.
AM Receiver for Aircraft Communications
AM-Receiver for Aircraft Communication 118.250MHz
Automicro RX3302 receiver module photo
Automicro RX3304 receiver module schematic
BCB Receiver without Coils - The radio consists of two phase-shifting
transistor stages (T1 and T2) and a RF amplifier (T3). The gain of T1 is almost
one (R4/R5). Phase shift of this stage is 90 degrees at a frequency determined
by P2 and C4. The second stage (T2) is identical to the first; the frequency of
90 degrees phase shift
Designing an AM Receiver For Low Power Wireless Systems Using the NEC UPC2768GR
IC 7/22/97 - Application Note California Eastern Laboratories Doc #921
One-transistor Regenerative AM Receiver - A classic design revamped
slightly. Features a single-transistor regen stage, and a range of 1000 miles
with a 4-foot antenna. Perhaps the best "survival radio", yet. Now updated with
Shortwave Audion - It is a Hartley-ECO Audion, in which the plate is
grounded for RF. Positive feedback from cathode to grid occurs via the coil tap.
The amount of feedback is determined by the 100k pot; this controls the voltage
at the screen grid and thereby the transconductance of the valve (higher voltage
resulting in greater trans conductance).
ZN414 Portable AM Receiver - 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has now been replaced by the MK484 which is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.