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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According to that site, you will need a bias current for most schottky diodes to get good performance.
The answer lies in a combination of things. It lists Vf as 1V at 5mA It’s never this black or white: But at mA it looks like it conducts 0. The 1N34A will conduct 0.
Use a proper crystal radio earphone!
Sign up using Facebook. I wanted to build one again recently and all I had a was a Schottky diode with a Vf of around 0. It lists Vf as 1V at dstasheet. If not, I hath been lead astray by this link and videos. 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.
Andy ddatasheet k 10 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. Would this still be a suitable replacement for a Ge diode? Look at the graph above – with uA flowing I bet the forward volt drop is probably 0. Home Questions Tags Users Unanswered. MichaelK 4 The 1N34A conducts much smaller currents with a lower Vf.
Once you have a working receiver, you can try datasbeet 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. As datashwet can see from 1n34x diagram from here, The 1N34A will conduct 0.
Since a crystal earphone draws very little current, Vf is also lower. How did I miss that? In reponse to comment: My biggest problem when building one as a kid was that we lived so far away from adtasheet transmitter that you pretty much had to get everything perfect and have a good antenna in order to pickup anything at all.
As you can see from this diagram from here. Try locating an actual crystal earpiece and give it a go. Look at this one: It is completely possible that another part of my circuit is to blame, I just want to rule out the diode. Thanks again for your replies. It may well be the diode that is causing problems.
You need the crystal earphone to avoid loading the tuning circuit and to keep the Vf low enough daatsheet the diode to demodulate the signal. Another thing to keep in mind is that they don’t have fanstatic range. Whether and how well it works at other audio frequencies is anybody’s guess.
Germanium Diode 1N34A
Sign up using Email and Password. I tested it indoors as well though and it still didn’t work so it wasn’t exclusively the temperature.
They are finicky enough that even slight variations will cause a failure – substituting parts is just asking for trouble. The typical load on a 1N34A diode in a crystal radio is a crystal earpiece with an impedance of 20kOhm. Email Required, but never shown.
Here’s link to a site about crystal radios with some hints about schottky diodes: The trick lies in the combination. With a lower If, Vf is 1n34w lower. I think that “a piezo buzzer” today datashewt comparable to a crystal earpiece. Post as a guest Name.