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For a better experience, please enable JavaScript in your browser before proceeding. Thread starter Nikolai Petrenko Start date Oct 24, Nikolai Petrenko Member Oct 24, I am searching something can replace these transistors: But and seem by fit to make push-pull amplifer. All I need are for radio receiver or RF, light I also want to know can 1N replace 1N34 in crystal radio.

I can’t find 1N34, no stores I asked have 1N34 or other germanium diode. I can make ft antenna and good ground for strong signal 1N heated or red LED in series with 1,5v cell will be good idea???

Mikebits Well-Known Member Oct 24, No the 1N will not replace a 1N34 or 1n34A. What makes the 1N34 different is the low forward voltage drop, on the order of.

So for your crystal radio you would need a germanium. I don’t know why you are having trouble finding the 1N34 diode. Using Google, this was the first link on my search results.

A 1N is completely different but try one in your crystal radio. Here in The West there are so many radio stations that a crystal radio is too simple and picks up a few stations at the same time. A crystal radio has one tuned LC circuit. Heated 1n had similar characteristics like 1n I think can made an stable heated 1n by wind few turns of nichrome around the diode than make a clay coat for it. The heat coil feed by battery.

I also hear red led in series datasheey battery can provide louder sound than 1n34 in some sites like techlib.

Willen Well-Known Member Oct 25, Hi, A heated 1N diode will come down in forward voltage, but it takes maybe degrees C to come down by maybe 0. You can also try biasing it with a little DC to help get the dynamic forward voltage down. It’s hard to adjust though, maybe with a Datasneet feed back circuit.


A red LED biased with 1. They also make fast low voltage Schottky diodes for small signal high frequency use. Datasheett datasheet for the 1N34A germanium diode said its forward voltage is typically 1V at 5mA eatasheet is much too high. The current in a crystal radio is much less then the forward voltage will also be much less so I found the datasheet 47 years old!

Germanium diodes have extremely low capacitance. The capacitance of a 1N Schottky diode is more than times higher. Mikebits Well-Known Member Oct 25, Clay and Nichrome, geezo, I don’t understand why you can’t get the right part as I showed you they are available on Ebay.


Perhaps you are being held prisoner in a Gulag somewhere in Siberia in which case, you may be interested in building this: A diode has internal resistance so its forward voltage gradually increases as its current increases. The germanium diode I showed has a typical 2n400 of 1V at 10mA but is 0. The 1N silicon diode typically is 0. The original datasyeet cannot buy ordinary electronic parts because he is a kid living far from a city in Vietnam.

I made a wood case satasheet it. I datashet in Canada not the OP and the weather is lovely today, no frost and no snow yet. The trees are dropping brightly colored leaves all over the place. Nikolai Petrenko Member Oct 25, I will try all stuff to find what is the best: Performance depends on your antenna and earpiece too. However I was unable to get audio from silicone diode like I just used an cellphone earpiece plays little louder than others and got loud audio like a volume 1 of my cellphone.

AM station is 20KM far. Willen Well-Known Member Oct 26, Wow, pretty interesting thing I saw today! I never thought that the a diode’s junction voltage drop forward voltage is depended to temperature in such GREAT way!

First I connected a 1N diode in a crystal radio and heated a lead of the diode with soldering iron almost 10 seconds. I got the the AM radio working after almost 5 seconds with small volume and got it increasing second by second.

At last it was working same as 1N34 or any schottky diode. To get the radio working the diode need to heat up in such bad way, the diode would not be able to survive more minutes. Another test is to measure its voltage drop by applying heat.


I connected the diode in DMM’s test probe and started to heat the lead of the diode. I have no temperature meter. I heated its one lead almost 45 seconds I was thinking the diode is going to blast, but it’s fine still.

Datashwet drop was mV at first and got around mV just after around 10 seconds of heating. Then decreasing voltage drop was not fast like till the 10 seconds. Around last seconds I got just mV hardly and I stopped heating I do not want to waste parts actually. So nice part is to make temperature sensor! The change in forward datxsheet of a silicon not silicone which is a synthetic rubber diode when its temperature changes is n24001 causes a poorly biased transistor not to work properly it is a temperature sensor.

The base-emitter forward voltage is 0. Each transistor is different, the voltage increases when the current increases and the voltage decreases when the temperature increases.

2N Datasheet PDF – Texas

Then a transistor with no series dwtasheet resistor and its base biased at 0. The transistor amplifies the changes in the forward voltage of its base-emitter diode. Nikolai Petrenko Member Oct 26, I have ft antenna but can longer to ft. I don’t have crystal earphone so I made one that attach piezoelectric diaphragm got from alarm chrono watch to a headphone. A crystal earphone has a very high impedance then it does not “load down” the low sound levels from a crystal radio.

A piezo transducer squeaks awful sounds. You forgot to datashret the input impedance of your amplifier. AM radio sounds awful. Its high frequencies are cut above about 2. We can hear to 20kHz if our hearing is not old or damaged. Electrical sparks car spark plugs or electrical switching and lightning are heard. Make an FM radio instead. You must log in or register to reply here. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Potentiometer Questions Started by norbss Yesterday at Started by fastline Yesterday at 8: Just saying hello Started by MichaelaJoy Yesterday at 6: This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

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