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.
|Country:||Antigua & Barbuda|
|Published (Last):||24 May 2008|
|PDF File Size:||20.38 Mb|
|ePub File Size:||11.63 Mb|
|Price:||Free* [*Free Regsitration Required]|
I wanted to build one again recently and all I had a was a Schottky diode with a Vf of around 0. But at mA it looks like it conducts 0. 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. Andy aka k 10 They are finicky enough that even slight variations will cause a failure – substituting parts is just asking for trouble.
A buzzer is made to work specifically at a particular frequency.
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. A piezo buzzer is meant to BUZZ at a particular frequency. I guess it didn’t help that I tested this radio outside in -5 degrees Celsius. The answer lies in a combination of things. Sign up using Facebook. 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 may work well, it may not. Look at the graph above – with uA flowing I bet the forward volt drop is probably 0. Interesting you mention temperature. Whether and how well it works at other audio frequencies 1n34aa anybody’s guess. With a lower If, Vf is also lower.
Use a proper crystal radio earphone! In reponse to comment: It lists Vf as 1V at 5mA.
It also indicates that most schottky diodes aren’t really good for crystal radios.
1N34A Datasheet pdf – Point Contact Germanium Diode – Honey Technology
They both use a piece of piezoelectric crystal to work. Email Required, but datashset shown. The 1N34A conducts much smaller currents with a lower Vf.
Since a crystal earphone draws very little current, Vf is also lower. Post as a guest Name. Try locating an actual crystal earpiece and give it a go.
I think that “a piezo buzzer” today isn’t comparable to dxtasheet crystal earpiece. The typical load on a 1N34A diode in a crystal radio is a crystal earpiece with an impedance of 20kOhm.
1N34A – 1N34A Germanium Diode Datasheet
Home Questions Tags Users Unanswered. Get it working right, first, though. It may well be the diode that is causing problems. Thanks again for your replies.
It is completely possible that another part of my circuit is to blame, I just want to rule out the diode. How did I miss that? I heard no sound from it through a piezo buzzer pressed against my ear and figured satasheet was maybe because of the diode, so I looked around for the datasheet for the 1N34A to read its characteristics. I tested it indoors as well though and it still didn’t work so it wasn’t exclusively the temperature.
MichaelK 4 If not, I hath been lead astray by this link and videos. Sign up using Email and Password.