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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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Look at this one: Sign up or log in Sign up using Google. It may work well, it may not.

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The typical load on a 1N34A diode in a crystal radio is a crystal earpiece with an impedance of 20kOhm. You need a low Vf because of the modulation scheme, not to 1h34a loading the tuning circuit. Post as a guest Name. Thank you for your answer and the clarification about why I need a low Vf and crystal earpiece.

You need the crystal earphone datashret avoid loading the tuning circuit and to keep the Vf low enough for the diode to demodulate the signal. Sign up using Email and Password. The answer lies in a combination of things. It may well be the diode that is causing problems.

1N34A Datasheet

It is completely possible that another part of my circuit is to blame, I just want to rule out the diode. Isn’t a crystal earpiece just a piezo buzzer? By clicking “Post Dagasheet Answer”, you acknowledge that you have read our updated terms of servicedtasheet policy and cookie policyand that your continued use of the website is subject to these policies. How did I miss that? Look at the graph above – with uA flowing I bet the forward volt drop is probably 0.


It all comes back to building the receiver right with all parts as specified, then you can start experimenting with buzzers as earphones or using other diodes, etc. Being a kid, of course, meant that I never got things really good enough. How well it will do anything else is anybody’s guess. I wanted to build one again recently and all I had a was 1n344a Schottky diode with a Vf of around 1m34a. Whether and how well it works at other audio frequencies is anybody’s guess.

1N34A – 1N34A Germanium Diode Datasheet

Since a crystal earphone draws very little current, Vf is also lower. I tested it indoors as well though and it still didn’t work so it wasn’t exclusively the temperature. The 1N34A conducts 11n34a smaller currents with a lower Vf. A buzzer is made to work specifically at a particular frequency. Back when I was younger I got a crystal radio set kit which included a 1N34A Ge diode as far as I can remember, I don’t have it anymore.

Germanium Diode 1N34A

With a lower If, Vf is also lower. Get it working right, first, though. It also indicates that most schottky diodes aren’t really good for crystal radios. It lists Vf as 1V at 5mA. Interesting you mention temperature.

Another thing to keep in mind is that they don’t have fanstatic range. Email Required, but never shown.

It lists Vf as 1V at 5mA It’s never this black or white: I think that “a piezo buzzer” today isn’t comparable to a crystal earpiece.

It is my understanding that Ge diodes were the choice for crystal sets because their low Vf does not load the tuned circuit. MichaelK 4 Sign up using Facebook. The 1N34A will conduct 0. 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.


A piezo buzzer is meant to BUZZ at a particular frequency. If not, I hath been lead astray by this link and videos. Use a proper crystal radio earphone! In reponse to comment: The trick lies in the combination.

They both use a piece of piezoelectric crystal to work.

My biggest problem ratasheet building one as a kid was that we lived so far away from any transmitter that you pretty much had to get everything perfect and have a good antenna in order to pickup anything at all. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

But at mA it looks like it conducts 0. Would this still be a suitable replacement for a Ge diode? Here’s link to a site about crystal radios with some hints about dtaasheet diodes: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our 1m34a terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.