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 also indicates that most schottky diodes aren’t really good for crystal radios. A datashret buzzer is meant to BUZZ at a particular frequency. Sign up using Facebook. If not, I hath been lead astray by this link and videos.
I guess it didn’t help that I tested this radio outside in -5 degrees Celsius. The 1N is made for lower frequencies and higher currents than a signal diode. Here’s link to a site about crystal radios with some hints about schottky diodes: Thanks again for your replies.
The answer dxtasheet in a combination of things. Isn’t a crystal earpiece just a piezo buzzer? 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. It lists Vf as 1V 13n4a 5mA It’s never this black or white: Interesting you mention temperature.
I heard no sound from it through a piezo ddatasheet 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. You need a low Vf because of the modulation scheme, not to avoid loading the tuning circuit.
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.
The 1N34A will conduct 0. The 1N34A conducts much smaller currents with a lower Vf. As you can see from this diagram from here. They are finicky enough that even slight variations will cause a failure – substituting parts is just asking for trouble. It is completely possible that another part of my circuit is to blame, I just want to rule out the diode. Try locating an actual crystal earpiece and give it a go. According to datashest site, you will need a bias current for most schottky diodes to get good performance.
Once you have a working receiver, you can datwsheet 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.
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As you can see from this diagram from here, The 1N34A will conduct 0. It may well be the diode that is causing problems.
In reponse to comment: It is my understanding that Ge diodes were the choice for crystal sets because their low Vf does not load the tuned circuit. Back when Datasheeh was younger I 1h34a 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 a particular frequency. Whether and how well it works at other audio frequencies is anybody’s guess.
1N34A – 1N34A Germanium Diode Datasheet
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. Another thing to keep in mind is that they don’t have fanstatic range.
I think that “a piezo buzzer” today isn’t comparable to a crystal earpiece. Email Required, but never shown.