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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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19th Dec 2018, 1:54 pm | #1 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,015
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"Gold-bonded" signal diodes: modern equivalents?
In the past I've used gold-bonded Germanium diodes in things like noise-limiters and speech-clippers. OA47 were the usual ones.
What's the modern equivalent? I need something that turns on at atound 0.1 - 0.2 volts and has a high back-resistance. They're for up-to-3KHz communications-grade audio-frequency service so switching speed is not an issue! Schottky diodes? |
19th Dec 2018, 3:27 pm | #2 |
No Longer a Member
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: "Gold-bonded" signal diodes: modern equivalents?
I tend to use the 1N5711 or HP 5082 series diodes. They still take about 0.2V to get into conduction, perhaps not quite as low as the germanium types but close.
http://w4neq.com/pdf/schottky_barrier-diodes.pdf Probably hard to beat the OA47 for the combination of low forward voltage drop and the higher forward current rating. So it depends on the application, if the Schottky is better or not.The piv rating of an OA47 is fairly low, and some of the Schottky's much higher, the 1N5711 is 70v. Last edited by Argus25; 19th Dec 2018 at 3:34 pm. |
19th Dec 2018, 3:51 pm | #3 |
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Re: "Gold-bonded" signal diodes: modern equivalents?
Cricklewood Electronics have them new.
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19th Dec 2018, 4:54 pm | #4 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,015
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Re: "Gold-bonded" signal diodes: modern equivalents?
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