Set of Devices for Radio Receiver Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-12610
Jlab Export is a leading Set of Devices for Radio Receiver Manufacturer,and suppliers in India
Set of Devices for Radio Receiver (code EL-PL-12610) is a crystal radio parts set: an antenna, a tuning circuit built from a 300 µH coil and a variable capacitor of about 300–500 pF, a germanium diode of the OA81 type, a filter, a fixed capacitor of about 100 pF and a very sensitive 2000 Ω piezoelectric earphone. The receiver needs no battery, as the antenna’s signal alone drives the earphone. These crystal radio parts are made by JLab in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Model | SCK1067/067 |
| Parts | Antenna, tuning circuit, diode, filter and earphone |
| Variable capacitor | About 300 pF to 500 pF |
| Fixed capacitor | About 100 pF |
| Diode | Germanium, OA81 type |
| Coil | Inductance 300 µH |
| Earphone | Piezoelectric, 2000 Ω type, very sensitive |
| Quality check | Each device set is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Product code | EL-PL-12610 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How the Signal Becomes Sound
The coil and variable capacitor form a resonant circuit that selects one frequency from all the signals reaching the antenna, f = 1/(2π√(LC)); turning the capacitor changes C and so moves the tuning. The germanium diode lets current through in one direction only, which removes one half of each cycle of the modulated carrier so that its average follows the audio waveform. Germanium suits this job because it starts to conduct at a lower voltage than silicon, so weak signals are not lost. The filter then removes what is left of the radio frequency, leaving an audio signal that the piezoelectric earphone turns into a faint but audible sound.
Improving Reception
A long wire antenna strung high and a good connection to earth collect more signal energy. Because the earphone works from the tiny power the antenna picks up, listen in a quiet room and tune the capacitor slowly.
Related Electronics Apparatus
- Set of Capacitors — fixed capacitors of several values for trial circuits.
- PN Junction Diode — diode kit with meters for forward and reverse bias study.
- Oscilloscope — displays the detected audio waveform during testing.
More electronics apparatus is in Physics Lab.
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Last updated: 26 October 2026
