am radio circuit | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Mon, 10 Oct 2016 03:59:05 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 am radio circuit | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 One Chip AM Radio Receiver https://electronicscheme.net/one-chip-am-radio-receiver/?utm_source=rss&utm_medium=rss&utm_campaign=one-chip-am-radio-receiver https://electronicscheme.net/one-chip-am-radio-receiver/#respond Thu, 14 Jan 2010 22:40:46 +0000 http://electronicscheme.net/?p=379 Here is the AM Radio receiver circuit diagram based on old single IC MK484. Components List: R9, R10_________ 6R8 R6_____________ 100R R3_____________ 1K R1_____________ 4K7 […]

The post One Chip AM Radio Receiver first appeared on Electronic Schematic Diagram.]]> Here is the AM Radio receiver circuit diagram based on old single IC MK484.

One Chip AM Radio Receiver circuit diagram

Components List:

R9, R10_________ 6R8
R6_____________ 100R
R3_____________ 1K
R1_____________ 4K7
R7_____________ 5K6
R4_____________ 10K
R2_____________ 100K
R5_____________ 150K
R8_____________ 820K
Pot_____________ 10K log pot
Coil & ferrite bar set		 C7______________ 470p ceramic
C, C4, C5, C6_____ 470nF monoblock
C2______________ 100nF monoblock
C3, C8___________ 100uF electrolytic capacitor
VariCap__________ 60/160 AM tuning cap
D1, D2, D3, D4____ 1N4148 diode
Q1, Q3___________ BC548
Q2______________ BC558
IC1_____________ MK484 AM radio IC TO92
Speaker__________ 0.5 or 1W, 8 ohm speaker

The MK484 we use is a Japanese copy of the original ZN414. It contains an RF amplifier, active detector and automatic gain control (AGC to improve sensitivity) all in a 3-pin package. The input impedence is typically 4M ohm. It operates over a range of 150kHz to 3MHz. DC supply of 1.1V to 1.8V & 0.3mA current drain makes it ideal for battery operation. The output is typically 40 – 60 mV of audio signal. Optimal AGC is provided by R3 and C2 (see Figure 2). R3 (the AGC resistor) should be in the range 100R to 1.5K. A bandwidth of about 4kHz is achieved.

Download the MK484 datasheet:
[wpdm_file id=52]

The MK484 is now a discontinued IC. It was made by New Japan Radio although it does not appear anywhere on their website(s). You may try to find the equivalent IC for MK484.

Download the complete explanation of this AM radio receiver circuit:
[wpdm_file id=53]

Note: The kit for this circuit is available at kitsrus.com.
AM Radio Receiver Kit

The post One Chip AM Radio Receiver first appeared on Electronic Schematic Diagram.]]> https://electronicscheme.net/one-chip-am-radio-receiver/feed/ 0 379 AM Radio Receiver https://electronicscheme.net/am-radio-receiver/?utm_source=rss&utm_medium=rss&utm_campaign=am-radio-receiver https://electronicscheme.net/am-radio-receiver/#comments Sat, 19 Dec 2009 01:52:33 +0000 http://electronicscheme.net/?p=342 This is the circuit diagram of mini AM Radio receiver. All general purpose transistors should work in this circuit, you can use BC549 transistors for […]

The post AM Radio Receiver first appeared on Electronic Schematic Diagram.]]> This is the circuit diagram of mini AM Radio receiver.

AM Radio Receiver

All general purpose transistors should work in this circuit, you can use BC549 transistors for this circuit.

The circuit use 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.

All connections should be short, a veroboard or tagstrip layout are suitable. The tuning capacitor has fixed and moving plates. The moving plates should be connected to the “cold” end of the tank circuit, this is the base of Q1, and the fixed plates to the “hot end” of the coil, the junction of R1 and C1. If connections on the capacitor are reversed, then moving your hand near the capacitor will cause unwanted stability and oscillation.

AM Radio Receiver PCB Design:

The image below is an actual size (scale= 1:1) copy of the copper layer. Note that this is reverse so the veropins appear now on the left hand side at the top. Remember that this is the lower (solder) side, by viewing the top image you should be able to match up the positions of all components.

AM Radio Receiver PCB

Please visit this page for detail explanation from author, schematic diagram and PCB layout of mini AM Rradio receiver circuit.

The post AM Radio Receiver first appeared on Electronic Schematic Diagram.]]> https://electronicscheme.net/am-radio-receiver/feed/ 8 342