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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Andy aka k 10 Perhaps I am misunderstanding the datasheet? 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.

MichaelK 4 It dayasheet indicates that most schottky diodes aren’t really good for crystal radios. It lists Vf as 1V at 5mA.

The 1N34A will conduct 0.

1N34A Datasheet(PDF) – Central Semiconductor Corp

As you can see from this diagram from here. You need a low Vf because of the modulation scheme, not to avoid loading the tuning circuit. Post Daatsheet Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy dahasheet and cookie policyand that your continued use of the website is subject to these policies. Sign up using Facebook. Use a proper crystal radio earphone! Thank you for your answer and the clarification about why I need a low Vf and crystal earpiece.

Another thing to keep in mind is that they don’t have fanstatic range.

1N34A Datasheet pdf – Point Contact Germanium Diode – Honey Technology

The trick lies in the combination. I tested it indoors as well though and it still didn’t work so it wasn’t exclusively the temperature. Also worth noting is that Vf is dependent on temperature. It may work well, it may not.


1N34A – 1N34A Germanium Diode Datasheet

My biggest problem when 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. It is completely possible that another part of my circuit is to blame, I just want to rule out the diode.

Once you have a working receiver, you can try using the piezo buzzer and see what it does and how it changes things – but that is an experiment for AFTER you have a working receiver. It all comes back to building the receiver right with all parts as specified, then datashset can start experimenting with buzzers as datawheet or using other datasheeet, etc. A buzzer is made to work specifically at a particular frequency. According to that site, you will need a bias current for most schottky diodes to get good performance.

But at mA it looks like it conducts 0. As you can see from this datashedt from here, The 1N34A will conduct 0.

Isn’t a crystal earpiece just a piezo buzzer? 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. With a lower If, Vf is also lower. Home Questions Tags Users Unanswered.

It may well be the diode that is causing problems. Sign up using Email and Password. Email Required, but never shown. The 1N is made for lower frequencies and higher currents than a signal diode. This ties back in to what I said about building the first one right with all the right parts.

Try locating an actual crystal earpiece and give it a go.

Thanks again for your replies. They both use a piece of piezoelectric crystal to work. Since a crystal earphone draws very little current, Vf is also lower.


I think that “a piezo buzzer” today isn’t comparable to a 1n3a4 earpiece. I wanted to build one again recently and all I had a was a Schottky diode with a Vf of around 0. How did I miss that? I heard no sound from it through a piezo buzzer pressed against my ear and figured it was maybe because of the diode, so I looked around for the datasheet for the 1N34A to read its characteristics.

Germanium Diode 1N34A

A piezo buzzer is meant to BUZZ at a particular frequency. Look at this one: 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. Whether and how well it works at other audio frequencies is anybody’s guess. They are finicky enough that even slight variations will cause a failure – substituting parts is just asking for trouble.

Here’s link to a site about crystal radios with some hints about schottky diodes: It lists Vf as 1V at 5mA It’s never this black or white: The answer lies in a combination of things. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The 1N34A conducts much smaller currents with a lower Vf.

Would this still be a suitable replacement for a Ge diode? Being a kid, of course, meant that I never got things really good enough. You need the crystal earphone to avoid loading the tuning circuit and to keep the Vf low enough for the diode to demodulate the signal.