Single Chip FM Radio Circuit
This to a great degree basic FM radio recipient circuit is made conceivable by the extraordinary reason TDA7000 IC. It coordinates about every one of the capacities important to construct a FM recipient requiring just a couple of outside capacitors and a tuning circuit. Utilizing a basic dynamic RC channel made of just a solitary inductor, a couple of resistors and a varicap, this FM recipient will get show radio between around 88 and 108 MHz. The mono yield sign can then be utilized to drive an arrangement of high impedance earphones, or food a force speaker.
| C1, C9, C12, C17 | 4 | 0.1uF Ceramic Disc Capacitor | |
| C2, C4, C5, C6, C13 | 5 | 0.01uF Ceramic Disc Capacitor | |
| C3 | 1 | 20pF Ceramic Disc Capacitor | See Notes |
| C7, C15, C16 | 3 | 0.001uF Ceramic Disc Capacitor | |
| C8, C10, C11 | 3 | 220pF Ceramic Disc Capacitor | |
| C14 | 1 | 100pF Ceramic Disc Capacitor | |
| C18 | 1 | 200pF Ceramic Disc Capacitor | |
| R1 | 1 | 22K 1/4W 5% Resistor | |
| R2 | 1 | 100K 1/4W 5% Resistor | |
| R3 | 1 | 100K Linear Taper Pot | |
| D1 | 1 | Motorola MV209 Varicap VHF Tuning Diode | |
| U1 | 1 | TDA7000 FM Radio IC | See Notes |
| L1 | 1 | 7 Turn Inductor (See Notes) | |
| MISC | 1 | Board, Wire, Socket For U1, Case |
Tragically, the TDA7000 went old a couple of years prior. The first form is made by Signetics (now Philips) and is getting a touch hard to discover nowadays. There are, then again, different choices. Philips makes the TDA7010T which is a surface mount form. The TDA7021T is likewise accessible which incorporates stereo capacity. They are electrically comparative however are just 16 pin chips so you'll have to contrast the datasheets with manufacture the circuit.
The estimation of C3 is noncritical and can be somewhere around 10pF and 20pF. Minor changes in accordance with L1 may be obliged taking into account the estimation of C3.
L1 is made by winding 7 turns of 24 AWG wire around pencil. Uproot the pencil and after that space the turns marginally.
Recurrence choice is by means of R3.
The estimation of C3 is noncritical and can be somewhere around 10pF and 20pF. Minor changes in accordance with L1 may be obliged taking into account the estimation of C3.
L1 is made by winding 7 turns of 24 AWG wire around pencil. Uproot the pencil and after that space the turns marginally.
Recurrence choice is by means of R3.
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