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Dear folks,

I built the cv gate keyboard shown below, schemo found in the Yves's blog archive.
Although it does work (outputs CV and GATE as expected), i keep getting a note shift on key press, an ...

hello guys,
i am also running my VCA 1 with 12 V.
Although working, it's output volume is very quite.
it's not clear to me what the R 23 and R 12 should be Smile

and, what's the unity gain?
thanks : ...

to hedefalk and Bastian

nice falling ramp there ! i got the same here Smile

happy to hear about your progresses ! sorry i cant help more

as for my oscilloscope grid, i havent me ...

where can i find the alternating current symbol in my pc keyboard? Embarassed

thanks Mattias. Priceless ! Wink

and thanks foe explaining the topology of the VCO.
so the core can be narrowed down to the mere 13700, 555 and IC 3 c ?
how do i go if i want to leave out the hard sync ? leave the 555 pin 4 unconne ...

thanks Mattias,
I can hear my VCO oscillating and sounds awesome.
The waves look perfect on the scope.

i am trying to find a way to measure their amplitude.
and trying to understand why, when s ...

hey mattias Smile

i am trying to make sense of my 555 VCO ouput levels.
Why can't AC saw,tri, square and sin be measured with a DMM ?

I do have an old scope, but the grid doesn't show numbers nor r ...

hey g.gabba

i don't know how the chat area works ! Rolling Eyes

back to the 555 VCO, it sounds awesomely good, it has that unmistakable "80's" flavor to my ears.
Can't wait to couple it with a Roland filter to get the best out of both modules Smile

hey g.gabba,

Yes, i think it's a nice thing to become friends here, and make some more "private" lines of communications, for a lack of a better term Smile

And besides the electronic DIY ...

Yves,
can you please get me the ARP 4072 schematics you originally drew ? i mean the schematics before the dual pot modification.
many thanks!

so,

i scoped up the 555 VCO output signals , and the amplitude of all waveforms stays consistent through the whole frequency sweep.

However, it still puzzles me that the voltage read on DMM chan ...

if you ever come to Sardinia island on holiday, drop me a line!

during the summer many Germans seem to enjoy our beaches and...beers too beer

hey Bastian,
i will take a look at those movies soon !
As far as the 555 VCO...well, no, i haven't checked it yet. Wink

it got a bit negleted in favour of some other little modules that were in ...

don't worry g.gabba about going off topic Very Happy

since the creator of this thread can't seem to be active anymore here, we can take advantage of this space and swap some infos and opinions.

However i ...

bastian are you from Berlin?
its electronic music scene has always appealed me. Techno and minimal.
And after watching Depeche Mode interviews,where they sing the praise of 1983-1986 Ber ...

it must be fun to live in Berlin

where are you from ? Cool

portugal?

thanks g.gabba

thanks Bastian

that makes sense Smile

2N 3819 and BF 245 are ok substitutes fot the original FET s from what i 've heard.
There is a interesting thread on Muffwiggler about the Jupiter 8 VCO cloning, where they discuss and document its o ...

to wackelpeter

why replace the FET buffers? this way the original sound would be completely gone. I aim to stay as close as possible to the orginal design

no worries g.gabba !

i built the 555 VCO by Thomas Henry only. And not the VCO 1 yet Smile

so i can't tell.
May i ask you to explain what the resistor value modifications would add to, or improve t ...

Author	Message
Topic: CV GATE keyboard -- Keys contact de bouncing needed?
alanwilder81 Replies: 3 Views: 5442	Posted: Sat Nov 03, 2018 2:48 pm Subject: CV GATE keyboard -- Keys contact de bouncing needed? Forum: DIY Hardware and Software » YuSynth
alanwilder81 Replies: 3 Views: 5442	Dear folks, I built the cv gate keyboard shown below, schemo found in the Yves's blog archive. Although it does work (outputs CV and GATE as expected), i keep getting a note shift on key press, an ...
Topic: VCA-1 using 12 volts
alanwilder81 Replies: 6 Views: 12195	Posted: Mon Sep 04, 2017 3:38 am Subject: VCA-1 using 12 volts Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 6 Views: 12195	hello guys, i am also running my VCA 1 with 12 V. Although working, it's output volume is very quite. it's not clear to me what the R 23 and R 12 should be and, what's the unity gain? thanks : ...
Topic: The VCO-555
alanwilder81 Replies: 479 Views: 560078	Posted: Thu Aug 31, 2017 7:09 am Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 479 Views: 560078	to hedefalk and Bastian nice falling ramp there ! i got the same here happy to hear about your progresses ! sorry i cant help more as for my oscilloscope grid, i havent me ...
Topic: The VCO-555
alanwilder81 Replies: 479 Views: 560078	Posted: Thu Aug 31, 2017 4:26 am Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 479 Views: 560078	where can i find the alternating current symbol in my pc keyboard?
Topic: The VCO-555
alanwilder81 Replies: 479 Views: 560078	Posted: Thu Aug 31, 2017 4:24 am Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 479 Views: 560078	thanks Mattias. Priceless !
Topic: The VCO-555
alanwilder81 Replies: 479 Views: 560078	Posted: Thu Aug 31, 2017 4:15 am Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 479 Views: 560078	and thanks foe explaining the topology of the VCO. so the core can be narrowed down to the mere 13700, 555 and IC 3 c ? how do i go if i want to leave out the hard sync ? leave the 555 pin 4 unconne ...
Topic: The VCO-555
alanwilder81 Replies: 479 Views: 560078	Posted: Thu Aug 31, 2017 3:58 am Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 479 Views: 560078	thanks Mattias, I can hear my VCO oscillating and sounds awesome. The waves look perfect on the scope. i am trying to find a way to measure their amplitude. and trying to understand why, when s ...
Topic: The VCO-555
alanwilder81 Replies: 479 Views: 560078	Posted: Thu Aug 31, 2017 1:26 am Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 479 Views: 560078	hey mattias i am trying to make sense of my 555 VCO ouput levels. Why can't AC saw,tri, square and sin be measured with a DMM ? I do have an old scope, but the grid doesn't show numbers nor r ...
Topic: The VCO-555
alanwilder81 Replies: 479 Views: 560078	Posted: Tue Aug 29, 2017 4:08 pm Subject: The VCO-555 Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 479 Views: 560078
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sun Aug 27, 2017 5:52 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	hey g.gabba i don't know how the chat area works !
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sun Aug 27, 2017 4:31 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	back to the 555 VCO, it sounds awesomely good, it has that unmistakable "80's" flavor to my ears. Can't wait to couple it with a Roland filter to get the best out of both modules
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sun Aug 27, 2017 4:16 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	hey g.gabba, Yes, i think it's a nice thing to become friends here, and make some more "private" lines of communications, for a lack of a better term And besides the electronic DIY ...
Topic: Arp 4072 VCF Bleedthrough Fix
alanwilder81 Replies: 24 Views: 28946	Posted: Sun Aug 27, 2017 2:31 am Subject: Arp 4072 VCF Bleedthrough Fix Forum: DIY Hardware and Software » YuSynth
alanwilder81 Replies: 24 Views: 28946	Yves, can you please get me the ARP 4072 schematics you originally drew ? i mean the schematics before the dual pot modification. many thanks!
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sat Aug 26, 2017 4:40 pm Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	so, i scoped up the 555 VCO output signals , and the amplitude of all waveforms stays consistent through the whole frequency sweep. However, it still puzzles me that the voltage read on DMM chan ...
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sat Aug 26, 2017 1:49 pm Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	if you ever come to Sardinia island on holiday, drop me a line! during the summer many Germans seem to enjoy our beaches and...beers too
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sat Aug 26, 2017 1:45 pm Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	hey Bastian, i will take a look at those movies soon ! As far as the 555 VCO...well, no, i haven't checked it yet. it got a bit negleted in favour of some other little modules that were in ...
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sat Aug 26, 2017 8:19 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	don't worry g.gabba about going off topic since the creator of this thread can't seem to be active anymore here, we can take advantage of this space and swap some infos and opinions. However i ...
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sat Aug 26, 2017 6:45 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	bastian are you from Berlin? its electronic music scene has always appealed me. Techno and minimal. And after watching Depeche Mode interviews,where they sing the praise of 1983-1986 Ber ...
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Sat Aug 26, 2017 12:01 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	it must be fun to live in Berlin
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Fri Aug 25, 2017 9:26 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	where are you from ? portugal?
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Fri Aug 25, 2017 3:10 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	thanks g.gabba
Topic: Roland SH101 VCF DIY
alanwilder81 Replies: 12 Views: 10769	Posted: Thu Aug 24, 2017 11:20 am Subject: Roland SH101 VCF DIY Forum: DIY Hardware and Software
alanwilder81 Replies: 12 Views: 10769	thanks Bastian that makes sense
Topic: Roland SH101 VCF DIY
alanwilder81 Replies: 12 Views: 10769	Posted: Thu Aug 24, 2017 10:43 am Subject: Roland SH101 VCF DIY Forum: DIY Hardware and Software
alanwilder81 Replies: 12 Views: 10769	2N 3819 and BF 245 are ok substitutes fot the original FET s from what i 've heard. There is a interesting thread on Muffwiggler about the Jupiter 8 VCO cloning, where they discuss and document its o ...
Topic: Roland SH101 VCF DIY
alanwilder81 Replies: 12 Views: 10769	Posted: Thu Aug 24, 2017 10:28 am Subject: Roland SH101 VCF DIY Forum: DIY Hardware and Software
alanwilder81 Replies: 12 Views: 10769	to wackelpeter why replace the FET buffers? this way the original sound would be completely gone. I aim to stay as close as possible to the orginal design
Topic: Vco-1 pulsewidth pitch problem
alanwilder81 Replies: 25 Views: 26377	Posted: Thu Aug 24, 2017 9:08 am Subject: Vco-1 pulsewidth pitch problem Forum: DIY Hardware and Software » Thomas Henry designs
alanwilder81 Replies: 25 Views: 26377	no worries g.gabba ! i built the 555 VCO by Thomas Henry only. And not the VCO 1 yet so i can't tell. May i ask you to explain what the resistor value modifications would add to, or improve t ...