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This is a simple RF receiver mainly for low-distance digital radio receiver application. The analog output of this circuit should be connected to a schmitt-trigger signal conditioning circuit with a proper value capacitor (from collector of T3). L1 for 27Mhz is about 10 turns, 6 mm diameter coil body.
Schematic diagram
 Board Layout
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Printed circuit board
components
| component |
value |
| R1 |
220k |
| R2 |
10k |
| R3 |
33k |
| R4 |
1M |
| R5 |
56k |
| R6 |
1M |
| R7 |
33k |
| R8 |
1k |
| C1 |
22p |
| C2 |
4.7p |
| C3 |
22p |
|
| component |
value |
| C4 |
2.2n |
| C5 |
10u |
| C6 |
4.7n |
| C7 |
22n |
| C8 |
4.7n |
| C9 |
470n |
| C10 |
470p |
| C11 |
47u |
| L2 |
100u |
| T1 |
BF198 |
| T2 |
BC182B |
| T3 |
BC182B |
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