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| Page 1 of 2 [28 Posts] | Goto page: 1, 2 Next |
| Author | Message |
|---|---|
 Topic: Wiring a this Comparator for single supply ? |
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| thepaddiscuile Replies: 8 Views: 8409 |
Posted: Fri Aug 23, 2019 5:12 am Subject:
Wiring a this Comparator for single supply ?
Forum: DIY Hardware and Software » Circuit Bending |
| These are things I haven't tested... I haven't tried adding resistors to ground, Wonder what values they would need to be ?
And your right.. Im feeding it with a saw tooth from a dixie II modular o ... |
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| Topic: Wiring a this Comparator for single supply ? |
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| thepaddiscuile Replies: 8 Views: 8409 |
Posted: Fri Aug 23, 2019 4:21 am Subject:
Wiring a this Comparator for single supply ?
Forum: DIY Hardware and Software » Circuit Bending |
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Notice that on your circuit input there is a differentiating RC resulting in converting rectangle like positive pulses into positive and negative saw-like spikes. You may need to play with R and ... |
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| Topic: Wiring a this Comparator for single supply ? |
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| thepaddiscuile Replies: 8 Views: 8409 |
Posted: Fri Aug 23, 2019 4:16 am Subject:
Wiring a this Comparator for single supply ?
Forum: DIY Hardware and Software » Circuit Bending |
| Thanks for the replies.. Yes I realize I can do it with a single supply chip but !!
To be honest I just didn't want to go down the road of buying more chips for a simple circuit.. I have 1 unused ... |
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| Topic: Wiring a this Comparator for single supply ? |
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| thepaddiscuile Replies: 8 Views: 8409 |
Posted: Thu Aug 22, 2019 7:04 am Subject:
Wiring a this Comparator for single supply ?
Forum: DIY Hardware and Software » Circuit Bending |
| Sorry I should mention that the chip used is a TL072 !!
I'm also using this.. |
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| Topic: Wiring a this Comparator for single supply ? |
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| thepaddiscuile Replies: 8 Views: 8409 |
Posted: Thu Aug 22, 2019 7:02 am Subject:
Wiring a this Comparator for single supply ?
Subject description: tl072 comparator Forum: DIY Hardware and Software » Circuit Bending |
| Hi Guys ;]
Trying to get this to work on a single supply of 12v I think it originally works on +-12v I send a gate or pulse in and the cap and resistor reduce it to a spike.. The comparator ha ... |
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| Topic: How to Apply Voltage offset in single supply Opamps |
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| thepaddiscuile Replies: 10 Views: 7092 |
Posted: Tue Jun 12, 2018 5:13 pm Subject:
How to Apply Voltage offset in single supply Opamps
Forum: DIY Hardware and Software » Developers' Corner |
| Again my apologies.. I meant that I increased the cap value to reduce the timing. with the smaller cap the pots Linearity was dicey heading towards ground, it would shift a few octaves with very littl ... | |
| Topic: How to Apply Voltage offset in single supply Opamps |
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| thepaddiscuile Replies: 10 Views: 7092 |
Posted: Tue Jun 12, 2018 4:28 pm Subject:
How to Apply Voltage offset in single supply Opamps
Forum: DIY Hardware and Software » Developers' Corner |
| Sorry I forgot to show a better version.. here it is
https://www.google.com/search?biw=1242&bih=574&tbm=isch&sa=1&ei=2MAeW6edM8iF0wLMxJX4BQ&q=lm324+vco&oq=lm324+vco&gs_l ... |
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| Topic: How to Apply Voltage offset in single supply Opamps |
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| thepaddiscuile Replies: 10 Views: 7092 |
Posted: Tue Jun 12, 2018 3:50 pm Subject:
How to Apply Voltage offset in single supply Opamps
Forum: DIY Hardware and Software » Developers' Corner |
| Cheers For the explanation... I will test that tomorrow on the board ;]
while were at it.. I also noticed that the triangle becomes slightly skewed below 100 Hz.. This could be another aforemention ... |
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| Topic: How to Apply Voltage offset in single supply Opamps |
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| thepaddiscuile Replies: 10 Views: 7092 |
Posted: Tue Jun 12, 2018 2:18 pm Subject:
How to Apply Voltage offset in single supply Opamps
Forum: DIY Hardware and Software » Developers' Corner |
Seems to work in my simulation..  Cheers for that..... Is that vref the trip point for the Schmidt trigger. Having trouble wondering as to why they would purposely offset the tri if they didn't have ... |
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| Topic: How to Apply Voltage offset in single supply Opamps |
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| thepaddiscuile Replies: 10 Views: 7092 |
Posted: Tue Jun 12, 2018 11:47 am Subject:
How to Apply Voltage offset in single supply Opamps
Subject description: Voltage offset single supply how to Forum: DIY Hardware and Software » Developers' Corner |
| Hi.. Everyone
Im designing a vco based off this classic schmitt/integrator design using Lm324 quad single supply opamps but Ive noticed that the triangle wave sits above ground. Id Like to Bias it ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Mon Sep 04, 2017 12:33 pm Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| The vco will only work with positive or negative voltage but not both ?
Then this does not allow a modular vco with+-5v waveforms to modulate the cv.. |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Mon Sep 04, 2017 7:16 am Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| problem with this configuration is that the amplitude of the sinewave at the output will vary with the position of the offset potentiometer.
True but that would be a set and forget resistor.. I us ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Mon Sep 04, 2017 7:13 am Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
that's pretty cool.. 
Thats how I would have done it too with the summing stage but I didn't know about the Pnp trick.. So with a pnp instead of an npn you can use negative voltages ? Why have y ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sun Sep 03, 2017 3:30 pm Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| I came up with this non inverting version.. It looks good in the simulation | |
| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sun Sep 03, 2017 3:13 pm Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| the mixer we have discussed here.. will only be used to convert my modulars waveforms to positive going only.. and other signals for example envelopes will not be used with this circuit because they a ... | |
| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sun Sep 03, 2017 10:45 am Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| Yeah.. I suppose I will need the offset just because in the real world some of the vcos and lfos might be slightly beefier than +-5v.
Especially with a drum circuit ,I wouldn't want a waveform sittin ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sun Sep 03, 2017 10:07 am Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
Whoops.. 
I had the negative rail of the opamp mistakenly powered from 12v, I forgot to type in -12v as the power supply.. A 47k limiting resistor for R8 gives my a perfect 10v positive s ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sun Sep 03, 2017 9:43 am Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| hm,
i need to understand ur needs better. The way iam doing drums is like in the attached blockdiagram. there i dont have a need for osc that can work with negative cv. may u have a blockdiagram ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sun Sep 03, 2017 9:39 am Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| Unless the VCO CV input range is larger than your CV signal you shouldn't need any gain at all.
If you do need gain then increasing R5 or R7 should indeed work. Personally I would increase R7. In ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sun Sep 03, 2017 7:44 am Subject:
simple linear tri vco for drum circuits
Forum: DIY Hardware and Software » Developers' Corner |
| I took a look at dc level shifters and tested this one from doepfer called cv mixer with offset function, on the diy page
http://www.doepfer.de/DIY/a100_diy.htm Got it to work on a computer simu ... |
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| Topic: simple linear tri vco for drum circuits |
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| thepaddiscuile Replies: 20 Views: 13444 |
Posted: Sat Sep 02, 2017 5:59 am Subject:
simple linear tri vco for drum circuits
Subject description: Simple linear vco ? Forum: DIY Hardware and Software » Developers' Corner |
| Hey everyone..
by any chance has anyone schematics of a low parts count vco that accepts bipolar cv and outputs a bipolar waveform.. I want to build up a drum voice on +-12v so im looking for a low ... |
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| Topic: problems with sequencer not triggering !! |
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| thepaddiscuile Replies: 2 Views: 2632 |
Posted: Tue Oct 04, 2011 6:24 pm Subject:
problems with sequencer not triggering !!
Forum: DIY Hardware and Software » Developers' Corner |
My Bad... solved it I think, I needed to put in a couple of nand gates and didn't spot it on the schematic I was looking at.
 |
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| Topic: problems with sequencer not triggering !! |
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| thepaddiscuile Replies: 2 Views: 2632 |
Posted: Tue Oct 04, 2011 3:29 pm Subject:
problems with sequencer not triggering !!
Forum: DIY Hardware and Software » Developers' Corner |
| Forgot to mention..
I haven't buffered the gate outputs yet because M stuck for space on Bread board. Doubt this should matter much yet but then again !! |
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| Topic: problems with sequencer not triggering !! |
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| thepaddiscuile Replies: 2 Views: 2632 |
Posted: Tue Oct 04, 2011 3:24 pm Subject:
problems with sequencer not triggering !!
Forum: DIY Hardware and Software » Developers' Corner |
| Yo..... I was wondering if somebody can figure this out..
I just breadboarded a 4017 based sequencer and wired it up as basic as possible to start on.. Just wired up a l.f.o for a trigger and us ... |
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| Topic: Escobedo Q&D VCF goes chaotic |
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| thepaddiscuile Replies: 38 Views: 73437 |
Posted: Fri Jul 23, 2010 10:46 am Subject:
 Escobedo Q&D VCF goes chaotic
Forum: DIY Hardware and Software |
| Hi guys.. Anyone know how you.d get a highpass response from this..
Be cool to have both running in series lp-hp |
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| Page 1 of 2 [28 Posts] | Goto page: 1, 2 Next |
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