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 Forum index » DIY Hardware and Software » Developers' Corner
Z5J noise diode equivilent
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gavw



Joined: Nov 02, 2017
Posts: 2
Location: UK

PostPosted: Thu Nov 02, 2017 3:30 pm    Post subject: Z5J noise diode equivilent Reply with quote  Mark this post and the followings unread

I am building the Penfold synth and I am sourcing the parts for the noise generator, which calls for a Z5J noise diode.

It seems to me this is now obsolete - Does anyone know of a modern replacement?

many thanks
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A R C



Joined: Dec 29, 2014
Posts: 3
Location: Earth

PostPosted: Thu Nov 02, 2017 6:20 pm    Post subject: Re: Z5J noise diode equivilent Reply with quote  Mark this post and the followings unread

gavw wrote:
Z5J ...Does anyone know of a modern replacement?


I think that was just an axial 5.1V zener diode. So, something like a 1N751? If you are breadboarding you could try a few different 5.1V zeners and audition them to find the... noisiest?
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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
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PostPosted: Fri Nov 03, 2017 3:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Or use a general purpose NPN transistor where the Emitter is connected where the Cathode of the diode is projected and the Base of the transistor where the Anode of the diode supposed to be.
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gavw



Joined: Nov 02, 2017
Posts: 2
Location: UK

PostPosted: Fri Nov 03, 2017 3:58 am    Post subject: Reply with quote  Mark this post and the followings unread

That's very helpful - thanks both for your input. Have either of you built the Penfold Synth previously?
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