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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The answer lies in a combination of things. I think that “a piezo buzzer” today isn’t comparable to a crystal earpiece. Datsheet need a low Vf because of the modulation scheme, not to avoid loading the tuning circuit. Another thing to keep in mind is that they don’t have fanstatic range. Try locating an actual crystal earpiece and give it a go.

Home Questions Tags Users Unanswered. Get it working right, first, though.

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MichaelK 4 Email Required, but never shown. With a lower If, Vf is also lower. 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.


Perhaps I am misunderstanding the datasheet? The 1N34A will conduct 0. It is my understanding that Ge diodes were eatasheet choice for crystal sets because their low Vf does not load the tuned circuit.

1N34A – 1N34A Germanium Diode Datasheet

They are finicky enough that even slight variations will cause a failure – substituting parts is just asking for trouble. It lists Vf as 1V at 5mA. I wanted to build one again recently and all I had a was a Schottky diode with a Vf of around 0. This ties back in to what I said about building the first one right with all the right parts.

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

They both use a piece of piezoelectric crystal to work. 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. Interesting you mention temperature.


Use a proper crystal radio earphone!

Look at datasheett graph above – with uA flowing I bet the forward volt drop is probably 0. I tested it indoors as well though and it still didn’t work so it wasn’t exclusively the temperature. In reponse to comment: If not, I hath been lead astray by this link and videos.

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 1N is made for lower frequencies and higher currents than a signal diode.

A buzzer is made to work specifically at a particular frequency. 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.

Andy aka k 10 Post as a guest Name.