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.
It lists Vf as 1V at 5mA It’s never this black or vatasheet I guess it didn’t help that I tested this radio outside in -5 degrees Celsius.
According to that site, you will need a bias 1b34a for most schottky diodes to get good performance. Another thing to keep in mind is that they don’t have fanstatic range.
Use a proper crystal radio earphone! Isn’t a crystal earpiece just a piezo buzzer?
1N34A – 1N34A Germanium Diode Datasheet
As you can see from this diagram from here, The 1N34A will conduct 0. The trick lies in the combination. With a lower If, Vf is also lower. 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. Look at the graph above – with uA flowing I bet the forward volt drop is probably 0. A buzzer is made to work specifically at a particular frequency. How did I miss that? Being a 1n43a, of course, meant that I never got things really good enough.
Post as a guest Name. Look at this one: Whether and how well it works at other audio frequencies is anybody’s guess. I think that “a piezo buzzer” today isn’t comparable to a crystal earpiece. Thank you for your answer and the clarification about why I need a low Vf and datqsheet earpiece.
If not, I hath been lead astray by this link and videos. It lists Vf as 1V at 5mA. Email Required, but never shown. Home Questions Tags Users Unanswered. 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. How well it will do anything else is anybody’s guess.
Perhaps I am misunderstanding the datasheet? Also worth noting is that Vf is dependent on temperature. Here’s link to a site about crystal radios with some hints about schottky diodes: It may well be the diode that is causing problems. Sign up using Facebook. MichaelK 4 A piezo buzzer is meant to BUZZ at a particular frequency.
It is completely possible that another part of my circuit is to blame, I just want to rule out the diode. Interesting you mention temperature.
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It all comes 1nn34a to building the receiver right with all parts as specified, then you can start experimenting with buzzers as earphones or using other diodes, etc. Since a crystal earphone draws very little current, Vf is also lower. It is my understanding that Ge diodes were the choice for crystal sets because their low Vf does not load the tuned circuit.
They both use a dayasheet of piezoelectric crystal to work. But at mA it looks like it conducts 0. Thanks again for your replies. 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 1n34x has built one successfully. Sign up using Email and Password.