This is the circuit diagram of mini FM received that build based on single FM IC TDA7012T.
Component Parts List:
| R1 = 8kΩ2 R2 = 10kΩ R3 = 390Ω C1,C3 = 10nF C2,C6,C9,C16 = 100nF C4 = 33pF C5 = 25pF trimmer (Murata type TZB4Z250AB10R00) C7,C10 = 1nF5 C8 = 820pF |
C11 = 1nF C12 = 68pF C13 = 220pF C14 = 47μF 10V (Nichicon UWX1A470MCL1GB 5.5mmL chip type) C15 = 3nF3 L1 = 36nH (4 turns 0.5mm silver-plated wire, inside diameter 4mm; length 7mm) L2 = 1μH, SMD case 0805 (fres > 300 MHz) IC1 = TDA7021T (SMD in SO16 case) |
Here the AM Radio receiver circuit diagram based on old single IC MK484.
Components part 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 |
This circuit is a powerful three stage, 9V FM transmitter (Tx) with a range of up to 1 kilometer in the open. It uses an RF transistor in its output stage and two BC547’s for the first two stages. Distance of trans-mission is critically dependent on the operating Conditions (in a building or out on the open), type of aerial used (single wire or dipole), operating voltage (12V is better than 6V) and if the circuit is peaked for maximum performance.
Components List:
| Resistors, 5%, 1/4W: 100R 1 470R 1 4K7 1 22K 1 39K 1 47K 2 1M 1 |
Capacitors: Trim cap 5-20pF, red – 1 5.6 pF ceramic – 1 10p ceramic – 2 47pF ceramic – 3 1nF ceramic – 1 20nF or 22nF ceramic – 2 100nF monoblock – 2 |
RF transistor ZTX320 – 1 Small signal transistor BC547 – 2 6 turn tinned copper coil – 1 6 turn enamelled coil – 1 8 turn enamelled coil – 1 9V battery snap – 1 Electret microphone – 1 PCB-mounted SPDT switch – 1 Antenna wire 1.6m |
If you’re interested in RF circuit, then you should khow about this basic RF oscillator.
This basic RF oscillator circuit is easy to build and the components are not critical. Most of them can be found in your junk parts box.
The L1 antenna col can be made by close winding 8 to 10 turns of 22 gauge insulted hookup wire around 1/4 inch form such as a pencil.
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 this circuit.
