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Schematic Circuits

Am Receiver Circuit

Application:

A small, simple AM receiver project with only 3 transistors. This circuit can pick up medium wave stations in your area.

De s c r i p t ion:

It can use general purpose transistors, and in this example there are 3 BC109C transistors. The schematic and BOM show a 200µH inductor and a trimmer capacitor 150-500pF, though these parts can be salvaged from an old AM radio, to preserve the directional nature of a tuning coil, and an adjustment knob (plate capacitor) that work well for radio reception.

The 120k resistor is for regenerative feedback between the Q2 NPN transistor and the input to the tank circuit. The value of this resistor is important to the performance of the entire AM receiver. In fact, it may be better to replace the fixed value with a variable resistor paired with a fixed resistor to adjust the oscillation and sensitivity. All the connections should be short to minimize interference.

Performance will vary depending on stray capacitance in your layout, the inductor winding/core/length, etc. Changing values of some of the capacitors, or adding them, as well as a potentiometer in the feedback loop can help with the performance of the receiver. With such a small circuit that is affected so much by its construction and its environment, a lot of hand tuning and experimentation will be fun, instructive, and possibly necessary to make it work best.


RefDesNameValuePart NumberDigi-Key Part NumberDe s c r i p t ion
C1VARIABLE500pFGMC31100GMC31100-NDCAP TRIMMER 150-500PF 175V TH
C2NON POLARIZED0.1uFC1005X5R1A104K050BA445-1265-1-NDCAP CER 0.1UF 10V 10% X5R 0402
L1AIR CORE200uHCTX16-17309-R513-1656-NDIND PFC 200UH 2.0A TOROID
Q1NPN ZTX1049ASTZZTX1049ASCT-NDTRANSISTOR NPN HIGH GAIN TO92-3
Q2NPN ZTX1049ASTZZTX1049ASCT-NDTRANSISTOR NPN HIGH GAIN TO92-3
Q3NPN ZTX1049ASTZZTX1049ASCT-NDTRANSISTOR NPN HIGH GAIN TO92-3
R2RESISTOR1KERJ-14YJ102UP1.0KVCT-NDRES 1K OHM 1/2W 5% 1210 SMD
R3RESISTOR330ERJ-14YJ331UP330VCT-NDRES 330 OHM 1/2W 5% 1210 SMD
C3NON POLARIZED0.1uFC1005X5R1A104K050BA445-1265-1-NDCAP CER 0.1UF 10V 10% X5R 0402
R1RESISTOR ERJ-14YJ124UP120KVCT-NDRES 120K OHM 1/2W 5% 1210 SMD
R4RESISTOR560KERJ-14YJ564UP560KVCT-NDRES 560K OHM 1/2W 5% 1210 SMD
R5RESISTOR10KERJ-14YJ103UP10KVCT-NDRES 10K OHM 1/2W 5% 1210 SMD
C4NON POLARIZED0.1uFC1005X5R1A104K050BA445-1265-1-NDCAP CER 0.1UF 10V 10% X5R 0402

Schematic of the receiver circuit

11 36f.jpg


Keywords : Am, Receiver, Circuit
Writer : delon  |
13 Jul 2019 Sat   
|  17 Views
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