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 Forum index » DIY Hardware and Software » Thomas Henry designs
An Easy AD Envelope Generator
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mercury8



Joined: Nov 25, 2018
Posts: 13
Location: grand rapids ohio

PostPosted: Sat Dec 22, 2018 1:05 pm    Post subject: Re: noob question Reply with quote  Mark this post and the followings unread

mercury8 wrote:
can this run off 12v?? and I thought most gate signals were +5v and it says that the gate responds to 1.8v? does this mean I need to have a gate that is a minimum of 1.8v? sorry about noob questions. im just trying to use this as a typical ar generater. typical 1voice snyth setup



I see now.ok a signal of ATLEAST 1.8v.
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mercury8



Joined: Nov 25, 2018
Posts: 13
Location: grand rapids ohio

PostPosted: Sat Dec 22, 2018 1:18 pm    Post subject: Re: ad generator Reply with quote  Mark this post and the followings unread

Grumble wrote:
mercury8 wrote:
can this run on 12v instead of 15 v?? and why does the schematic call for 100pf cap for c2 and the layout has a 10nf for c2??

Yes, it can run on 12 volt, but the resistors R6 and R7 have to be recalculated, since the threshold pin will trip at 2/3 Vs, so at 12 volt it trips at 8 volt, you have to devide that to 5 volt: R6 = 3k3, R7 = 5k6.
As far as I can see, what is called C2 on the stripboard is actually C3 (10nF going to pin 5 of the 555) and C2 is placed on the input connectors (off print).


thanks a lot grumble. I tried running it on 12 v euro ps and got signal through it but that's it. so it didn't work. I believe that I do need to change r6 and 67 and I think I got c2 and c3 mixed uo. thanks a lot. really appreciate it
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