1N34A Datasheet, 1N34A Germanium Diode Datasheet, buy 1N34A Diode. The typical load on a 1N34A diode in a crystal radio is a crystal crystal radio is lower than you would expect from the Vf entry in the datasheet. 1N34A Germanium Diode, Package: DO Can be used in many AM, FM and TV-IF applications, replacing point contact devices.. Applications. TV audio.

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It is completely possible that another part of my circuit is to blame, I just want to rule out the diode. The answer lies in a combination of things. Perhaps I am misunderstanding the datasheet? It may work well, it may not. It also indicates that most schottky diodes aren’t really good for crystal radios. From my own experience in building crystal radios, you would be well advised to build the first one using exactly the parts recommended and exactly the schematic of someone who has built one successfully.

Interesting you mention temperature. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Email Required, but never shown. It lists Vf as 1V at 5mA. The typical load on a 1N34A diode in a crystal radio is a crystal earpiece with an impedance of 20kOhm.

Post as a guest Name. Another thing to keep in mind is that they don’t have fanstatic range.

Since a crystal earphone draws very little current, Vf is also lower. Get it working right, first, though. Sign up or log in Sign up using Google.

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I guess it didn’t help that I tested this radio outside in -5 degrees Celsius.

They are finicky enough that even slight variations will cause a failure – substituting parts is just asking for trouble. Would this still be a suitable replacement for a Ge diode? Thanks again for your replies. The 1N34A will conduct 0.

Here’s link to a site about crystal radios with some hints about schottky diodes: With a lower If, Vf is also 1n3a4. A buzzer is made to work specifically at a particular frequency.

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A piezo buzzer is meant to BUZZ at a particular frequency. If not, Datashset hath been lead astray by this link and videos. It is my understanding that Ge diodes were the choice for crystal sets because their low Vf does not load the tuned circuit. Sign up using Email and Password. Home Questions Tags Users Unanswered.

The trick lies in the combination. I heard no sound datadheet it through a piezo buzzer pressed against my ear and figured it was maybe datwsheet of the diode, so I looked around for the datasheet for the 1N34A to read its characteristics.

This ties back in to what I said about building the first one right with all the right parts. I wanted to build one again recently and all I had a was a Schottky diode with a Vf of around 0. The 1N34A conducts much smaller currents with a lower Vf.

Germanium Diode 1N34A

MichaelK 4 My biggest problem when building one as a kid was that we lived so far away from any 1b34a that you pretty much had to get everything perfect and have a good antenna in order to pickup anything at all. Thank you for your answer and the clarification about why I need a low Vf and crystal earpiece. Look at the graph above – with uA flowing I bet the forward volt drop is probably 0.


Whether and how well it works at other audio frequencies is anybody’s guess. Sign up using Facebook. In reponse to comment: How did I miss that? I think that “a piezo buzzer” today isn’t comparable to a crystal earpiece.

You need a low Vf because of the modulation scheme, not to avoid loading the tuning circuit. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

They both use a piece of piezoelectric crystal to work. It lists Vf as 1V at 5mA It’s never this black or white: Also worth noting is that Vf is dependent on temperature. As you can see from this diagram from here. Back when I was younger I 1n34 a crystal 1n43a set kit which included a 1N34A Ge diode as far as I can remember, I don’t have it anymore.

Andy aka k 10 Try locating an actual crystal earpiece and give it a go. I tested it indoors as well though and it still didn’t work so it wasn’t exclusively the temperature.

As you can see from this diagram from here, The 1N34A will conduct 0.