Timeline for How to design a crystal radio receiver on a bread board?
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 2, 2021 at 17:48 | vote | accept | Alex | ||
| May 2, 2021 at 16:16 | comment | added | Alex | @JRE infact I want to know that what value of inductance, capacitance may i use to get the desired rasonance frequency and to drive the diode and ear phones at the same time? About that design I asked for. I will appreciate if you can give me an example of such a circuit. | |
| May 2, 2021 at 15:23 | comment | added | JRE | @Alex: You have a design - that's the schematic diagram. You seem to want to build the circuit on a bread board. | |
| May 2, 2021 at 14:03 | comment | added | Marcus Müller | (but please be careful if using an outlet: under no circumstances should you connect your radio to the live wire) | |
| May 2, 2021 at 13:05 | comment | added | glen_geek | A simpler circuit doesn't need a breadboard. Your diode in parallel with the high-impedance headphones should give some audio. Many folks put more effort into their antenna wire, and forget about the ground connection, which is equally important...I've used a convenient electrical outlet's ground. Antenna goes to one end of the diode/headphone - ground goes to the other end of the diode/headphone. Simple | |
| May 2, 2021 at 9:50 | comment | added | Artichoke | @Mattman944 If kids are learning about RF electronics in school, they would probably be old enough to handle a soldering iron safely without burning themselves. | |
| May 2, 2021 at 9:45 | comment | added | mmmm | Alex, you'll need to have a very high impedance ear phone in your lab equipment. That's typically where the buck stops. | |
| May 2, 2021 at 8:52 | answer | added | Andy aka | timeline score: 1 | |
| May 2, 2021 at 8:29 | review | Close votes | |||
| May 2, 2021 at 9:04 | |||||
| May 2, 2021 at 8:20 | comment | added | Alex | @Mattman944 I just want to design this circuit on bread board using lab components. | |
| May 2, 2021 at 7:53 | comment | added | Mattman944 | Tell us your real goal and you will get better answers. Is this for a classroom of kids and you don't want them to solder? You could probably use screws into a wood board to make your connections. What are your time limitations? Winding the coil is time consuming, could the coil be a homework assignment? A fair percentage of kids won't be able to build a usable coil, what will you do then? | |
| May 2, 2021 at 7:48 | comment | added | Mattman944 | stem-supplies.com/science/circuits/build-a-crystal-radio-kit This seems to imply that it is possible. Keep the connections far apart to minimize the capacitance. | |
| May 2, 2021 at 7:32 | answer | added | Paolo | timeline score: 1 | |
| May 2, 2021 at 7:30 | comment | added | Circuit fantasist | I suppose the diode VF will be important... also the coil construction... I remember doing such exotics in the 60's. For example, I used a graphite contact with a razor blade as a diode. I also melted sulfur and lead in a test tube for some such "diode"... Primitive but I guess with low VF it was. The inductor was flat with a large surface or cylindrical... The earphone was electromagnetic ... | |
| May 2, 2021 at 7:21 | comment | added | Unimportant | Don't know if such a carrier powered radio circuit can work on breadboard (parasitics might be a problem), but know that such circuits typically require a crystal earphone. | |
| May 2, 2021 at 6:50 | history | asked | Alex | CC BY-SA 4.0 |