Build and analyse a basic commercial radio recevier kit
Just my notes on a build of a kit from a seller on aliexpress.
A superheterodyne receiver (often shortened to superhet) uses frequency mixing to convert a received signal (at a variable frequency) to a fixed intermediate frequency (IF) which can be more conveniently processed with known gain and selectivity.
| Ref | Part | Notes |
|---|---|---|
| V1,2,3 | 9018 | NPN transistor |
| V4 | 9014 | NPN transistor |
| V5,6 | 9013H | NPN transistor |
| LED | 3mm LED | |
| T1 | transformer | |
| T2,3,4 | transformer | |
| T5 | transformer | |
| BL | 8Ω speaker | |
| R6,8,10 | 100Ω resistor | |
| R7,9 | 120Ω resistor | |
| R11 | 330Ω resistor | |
| R2 | 1.8kΩ resistor | |
| R4 | 30kΩ resistor | |
| R5 | 100kΩ resistor | |
| R3 | 120kΩ resistor | |
| R1 | 200kΩ resistor | |
| RP | 5kΩ pot | |
| C6 | 0.47µF electrolytic cap | |
| C3 | 10µF electrolytic cap | |
| C8,9,10 | 100µF electrolytic cap | |
| C2 | 682 6.8nF ceramic cap | |
| C1 | 103 10nF ceramic cap | |
| C4,5,7,11 | 223 22nF ceramic cap | |
| Ca,Cb | CBM-223P variable capacitor |
- Superheterodyne Receiver - wikipedia
- the kit from a seller on aliexpress
- Introduction to the Superheterodyne Receiver - by Lloyd Butler VK5BR
- Block Diagram of Superheterodyne Receiver Radio - Ian Pool. A good description of the modules.
- Radio Receivers Book - Chapter 4 Superheterodyne Radio Receivers - Miomir Filipovic
- Superheterodyne: BJT AM receiver - fascinating project notes by He Yong Li