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 lists Vf as 1V at 5mA It’s never this black or white: Here’s link to a site about crystal radios with some hints about schottky diodes: Being a kid, of course, meant that I never got things really good enough.
A piezo buzzer is meant to BUZZ at a particular frequency.
Germanium Diode 1N34A
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.
Sign up using Facebook. How well it will do anything else is anybody’s guess. It may well be the diode that is causing problems. Thank you for your answer and the clarification about why I need a low Vf and crystal earpiece.
As you can see from this diagram from here, The 1N34A will conduct 0. 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. My biggest problem when building one as a kid was that we lived so far away from 1n34s transmitter that you pretty 1h34a had to get everything perfect and have a good antenna in order to pickup anything at all.
According to that site, you will need a bias current for most schottky diodes to get good performance. I guess it didn’t help that 1n34w tested this radio outside in -5 degrees Datwsheet. Home Questions Tags Users Unanswered. It is completely possible that another part of my circuit is to blame, I just want to rule out the diode.
They both use a piece of piezoelectric crystal to work. It may work well, it may not. With a lower If, Vf is also lower. The trick lies in the combination. Perhaps I am misunderstanding the datasheet?
I tested it indoors as well though darasheet it still didn’t work so it wasn’t exclusively the temperature. As you can see from this diagram from here. Email Required, but never shown. The answer lies in a combination of things. MichaelK 4 But at mA it looks like datassheet conducts 0. Look at this one: The 1N34A conducts much smaller currents with a lower Vf.
Also worth noting is that Vf is dependent on temperature.
1N34A Datasheet pdf – Point Contact Germanium Diode – Honey Technology
Try locating an actual crystal earpiece and give it a go. It lists Vf as 1V at 5mA. 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.
Since a crystal earphone draws very little current, Vf is also lower. 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.
Another thing to keep in mind is that they don’t have fanstatic range. Thanks again for your replies. It also indicates that most schottky diodes aren’t really good for crystal radios.
I wanted to build one again recently and all I had a was a Schottky diode with a Vf of around 0. 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. You need a low Vf because of the modulation scheme, dahasheet to avoid loading the tuning circuit.
The typical load on a 1N34A diode in a crystal radio is a crystal earpiece with an impedance of 20kOhm. Sign up or log in Sign up using Google.