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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1N34A – 1N34A Germanium Diode Datasheet
Perhaps I am misunderstanding the datasheet? The 1N34A will conduct 0.
If not, I hath been lead astray by this link and videos. Being datxsheet kid, of course, meant that I never got things really good enough.
They both use a piece of piezoelectric crystal to work.
1N34A Datasheet pdf – Point Contact Germanium Diode – Honey Technology
Also worth noting is that Vf is dependent on temperature. 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.
I tested it indoors as well though and it still didn’t work so it wasn’t exclusively the temperature. The answer lies in a combination of things.
Here’s link to a site about crystal radios with some hints about schottky diodes: You need a low Vf because of the modulation scheme, not to avoid loading the tuning circuit.
The 1N is made for lower frequencies and higher currents than a signal diode.
The 1N34A conducts much smaller currents with a lower Vf.
Another thing to keep in mind is that they don’t have fanstatic range. Home Questions Tags Users Unanswered.
Germanium Diode 1N34A
Whether and how well it works at other audio frequencies is anybody’s guess.
Post as a guest Name. Sign up or log in Sign up using Google. Sign up using Email and Password. It is my understanding that Ge diodes were the choice for crystal sets because their low Vf does not load the tuned circuit. As you can see from this diagram from here, The 1N34A will conduct 0. It lists Vf as 1V at 5mA It’s never this black or white: How did I miss that?
It may well be the diode that is causing problems.
Germanium Diode 1N34A
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. 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. A buzzer is made to work specifically at adtasheet particular frequency. Isn’t a crystal earpiece just a piezo buzzer?
Thanks again for your replies. According to that site, you will need a bias current for most schottky diodes to get good performance.