Search found 102 matches

Google Hammond tonewheel organs - they do what you are talking. Bulidng one of those would be an interesting DIY challenge

Sorry! Not only did I not provide a link, I mixed up my Kaisers. Of course I meant Tim Kaiser, and some relevant examples are here - http://timkaiser.org/bedlam-sequencers.

Henry Kaiser, on the ot ...

Oh yeah, also check out Henry Kaiser's stuff

Have you seen the steampunk (tubepunk?) midi controllers made from old test gear for Thomas Dolby?

Well, an AVR is just one way to do this digitally. It could go either way... analog or digital. Digital offers precision, analogue offers (useful?) unpredictability.

In a way, the concept reminds m ...

Hmmm - looking at the shift register a bit more, I can see that this is something quite different. The shift register pushes the voltage sequentially through all the S&H stages, whereas this multi ...

As part of the effort to combat droopiness, may I suggest the following? I know the initial impulse was to avoid quantisers, but if one was available, the output could be quantised. Once the sequence ...

Trombone artillery - http://en.wikipedia.org/wiki/File:Wartuba.jpg

Seconding AndrewF's answers. The trombone is built to resonate, so there'll always be an acoustic path between the input and output transducers.

It seems to me though that a speaker/mike combinati ...

It's a biometric device for identifying aliens from the planet Snurf. The rotating sensors read the unique patterns of dimples on the end of the Snurfian's bifurcated fronds. The speed settings indica ...

Apparently you can also make a temperature stable converter by putting an AD633 multiplier in the feedback loop of an op amp. Caveats: I haven't seen a circuit anywhere; it could be a bit expensive

The switched capacitor filters in the ETI4600 synthesiser have a clock circuit something like you described - details herehttp://www.eti4600synthesiser.org.uk/ETI_Part6.pdf

This clock produces a pu ...

There's an idea for a voltage controlled warp circuit at the bottom of http://www.muzique.com/lab/warp.htm that seems to be somewhat unusual

This might work. The approach is a little indirect, but it gets there in the end. First, look at René Schmitz's 3 phase LFO -
a phase shift oscillator built arround three gates of a 4069. The resis ...

Thanks for those scans - you're right that it's not the object I am (mis?)remembering but it's still marvellous to see these. Those early synth pioneers were wonderfully inventive. To this day, nobody ...

v-un-v "Wouldn't a ring mod just produce a sum and difference of the two frequencies it was fed with". Exactly. So, if you had a 100khz fixed oscillator and another that varied from 100-120k ...

v-un-v - what basic waveform are you looking for? Seems to me that two HF sine wave oscillators (one fixed, one variable) fed into a diode ring mod should give you heterodyne frequencies in the audio ...

I know this thread is spinning off from the end you want to achieve, but I just thought I'd get this idea down. How about clocking a simple switched capacitor filter from higher up in the divider chai ...

Start with sine waves and use CMOS circuits to clip them into square waves. There are plenty of one transistor sine wave oscillator circuits around.

Big thank you, dingebre, for taking this on. Huge thank you to Mr Steiner for understanding that open sourcing his historical intellectual property in this generous way benefits the community, and can ...

For an echo/delay, you'll need to clock the flip-flops, and each one will delay the incoming signal by one clock cycle. Let's say you have very lo-fi clock signal (thus sampling rate) of 6Khz. You'd n ...

Not so much an organ as a source of spare part goodies - that expression pedal is crying out to be made into an FX pedal...

I guess the single biggest source of problems is the keyboard - this is where biggest culprit in generating clicks, induced AC hum, crosstalk & so on. That's why more modern organ designs only put ...

If you want to solve all the usual organ problems (noise, crosstalk, bleed) then you'll end up building a conventional organ with all that that implies in having keying circuitry and so on. If you wan ...

It's a PA397 from OnChip. The forum linked to below says -It's basically a 3396 with stereo outs. It's now a 28 pin chip instead of the 24 pin package that the 3396 came in. In reasonable quantities ...

Author	Message
Topic: Guitar pickup Pitch changer
slabman Replies: 28 Views: 19060	Posted: Wed Sep 22, 2010 5:52 am Subject: Guitar pickup Pitch changer Forum: DIY Hardware and Software
slabman Replies: 28 Views: 19060	Google Hammond tonewheel organs - they do what you are talking. Bulidng one of those would be an interesting DIY challenge
Topic: Anyone modified an old heathkit oscillator
slabman Replies: 4 Views: 2355	Posted: Fri Sep 03, 2010 3:47 pm Subject: Anyone modified an old heathkit oscillator Forum: DIY Hardware and Software
slabman Replies: 4 Views: 2355	Sorry! Not only did I not provide a link, I mixed up my Kaisers. Of course I meant Tim Kaiser, and some relevant examples are here - http://timkaiser.org/bedlam-sequencers. Henry Kaiser, on the ot ...
Topic: Anyone modified an old heathkit oscillator
slabman Replies: 4 Views: 2355	Posted: Fri Sep 03, 2010 2:27 am Subject: Anyone modified an old heathkit oscillator Forum: DIY Hardware and Software
slabman Replies: 4 Views: 2355	Oh yeah, also check out Henry Kaiser's stuff
Topic: Anyone modified an old heathkit oscillator
slabman Replies: 4 Views: 2355	Posted: Fri Sep 03, 2010 2:26 am Subject: Anyone modified an old heathkit oscillator Forum: DIY Hardware and Software
slabman Replies: 4 Views: 2355	Have you seen the steampunk (tubepunk?) midi controllers made from old test gear for Thomas Dolby?
Topic: Programmable Analog Sequencer Idea
slabman Replies: 34 Views: 12645	Posted: Tue Aug 24, 2010 9:30 am Subject: Programmable Analog Sequencer Idea Forum: DIY Hardware and Software
slabman Replies: 34 Views: 12645	Well, an AVR is just one way to do this digitally. It could go either way... analog or digital. Digital offers precision, analogue offers (useful?) unpredictability. In a way, the concept reminds m ...
Topic: Programmable Analog Sequencer Idea
slabman Replies: 34 Views: 12645	Posted: Mon Aug 23, 2010 6:11 am Subject: Programmable Analog Sequencer Idea Forum: DIY Hardware and Software
slabman Replies: 34 Views: 12645	Hmmm - looking at the shift register a bit more, I can see that this is something quite different. The shift register pushes the voltage sequentially through all the S&H stages, whereas this multi ...
Topic: Programmable Analog Sequencer Idea
slabman Replies: 34 Views: 12645	Posted: Mon Aug 23, 2010 5:55 am Subject: Droopine Forum: DIY Hardware and Software
slabman Replies: 34 Views: 12645	As part of the effort to combat droopiness, may I suggest the following? I know the initial impulse was to avoid quantisers, but if one was available, the output could be quantised. Once the sequence ...
Topic: Building a speaker for bell of trombone - have ?s
slabman Replies: 6 Views: 3836	Posted: Sun Aug 15, 2010 2:02 pm Subject: Building a speaker for bell of trombone - have ?s Forum: DIY Hardware and Software
slabman Replies: 6 Views: 3836	Trombone artillery - http://en.wikipedia.org/wiki/File:Wartuba.jpg
Topic: Building a speaker for bell of trombone - have ?s
slabman Replies: 6 Views: 3836	Posted: Sat Aug 14, 2010 5:07 pm Subject: Building a speaker for bell of trombone - have ?s Forum: DIY Hardware and Software
slabman Replies: 6 Views: 3836	Seconding AndrewF's answers. The trombone is built to resonate, so there'll always be an acoustic path between the input and output transducers. It seems to me though that a speaker/mike combinati ...
Topic: An interesting box
slabman Replies: 3 Views: 1894	Posted: Thu Aug 12, 2010 4:12 am Subject: An interesting box Forum: DIY Hardware and Software
slabman Replies: 3 Views: 1894	It's a biometric device for identifying aliens from the planet Snurf. The rotating sensors read the unique patterns of dimples on the end of the Snurfian's bifurcated fronds. The speed settings indica ...
Topic: Expo Converter compatible to any VCO?
slabman Replies: 2 Views: 3645	Posted: Wed Aug 11, 2010 9:15 am Subject: Expo Converter compatible to any VCO? Forum: DIY Hardware and Software
slabman Replies: 2 Views: 3645	Apparently you can also make a temperature stable converter by putting an AD633 multiplier in the feedback loop of an op amp. Caveats: I haven't seen a circuit anywhere; it could be a bit expensive
Topic: Voltage Controlled Pulse
slabman Replies: 2 Views: 3872	Posted: Wed Aug 11, 2010 7:29 am Subject: Voltage Controlled Pulse Forum: DIY Hardware and Software » Developers' Corner
slabman Replies: 2 Views: 3872	The switched capacitor filters in the ETI4600 synthesiser have a clock circuit something like you described - details herehttp://www.eti4600synthesiser.org.uk/ETI_Part6.pdf This clock produces a pu ...
Topic: Any recommended modular Distortion/Waveshapers?
slabman Replies: 24 Views: 13257	Posted: Thu Aug 05, 2010 3:14 pm Subject: Any recommended modular Distortion/Waveshapers? Forum: DIY Hardware and Software
slabman Replies: 24 Views: 13257	There's an idea for a voltage controlled warp circuit at the bottom of http://www.muzique.com/lab/warp.htm that seems to be somewhat unusual
Topic: DCO square wave to triangle/sawtooth wave
slabman Replies: 11 Views: 9782	Posted: Fri Jul 23, 2010 1:44 pm Subject: DCO square wave to triangle/sawtooth wave Forum: DIY Hardware and Software
slabman Replies: 11 Views: 9782	This might work. The approach is a little indirect, but it gets there in the end. First, look at René Schmitz's 3 phase LFO - a phase shift oscillator built arround three gates of a 4069. The resis ...
Topic: Ondes Martenot Schematic
slabman Replies: 12 Views: 16917	Posted: Fri Jul 09, 2010 4:56 pm Subject: Ondes Martenot Schematic Forum: DIY Hardware and Software
slabman Replies: 12 Views: 16917	Thanks for those scans - you're right that it's not the object I am (mis?)remembering but it's still marvellous to see these. Those early synth pioneers were wonderfully inventive. To this day, nobody ...
Topic: Ondes Martenot Schematic
slabman Replies: 12 Views: 16917	Posted: Wed Jul 07, 2010 5:23 am Subject: Ondes Martenot Schematic Forum: DIY Hardware and Software
slabman Replies: 12 Views: 16917	v-un-v "Wouldn't a ring mod just produce a sum and difference of the two frequencies it was fed with". Exactly. So, if you had a 100khz fixed oscillator and another that varied from 100-120k ...
Topic: Ondes Martenot Schematic
slabman Replies: 12 Views: 16917	Posted: Tue Jul 06, 2010 3:33 pm Subject: Ondes Martenot Schematic Forum: DIY Hardware and Software
slabman Replies: 12 Views: 16917	v-un-v - what basic waveform are you looking for? Seems to me that two HF sine wave oscillators (one fixed, one variable) fed into a diode ring mod should give you heterodyne frequencies in the audio ...
Topic: Sine wave shaper that's NOT a filter?
slabman Replies: 25 Views: 28170	Posted: Mon Jun 21, 2010 2:59 pm Subject: No idea if this would work... Subject description: No idea if this would work... Forum: DIY Hardware and Software
slabman Replies: 25 Views: 28170	I know this thread is spinning off from the end you want to achieve, but I just thought I'd get this idea down. How about clocking a simple switched capacitor filter from higher up in the divider chai ...
Topic: Sine wave shaper that's NOT a filter?
slabman Replies: 25 Views: 28170	Posted: Fri Jun 18, 2010 4:27 am Subject: another approach Forum: DIY Hardware and Software
slabman Replies: 25 Views: 28170	Start with sine waves and use CMOS circuits to clip them into square waves. There are plenty of one transistor sine wave oscillator circuits around.
Topic: Steiner Synthasystem Modular Resurrection
slabman Replies: 7 Views: 3257	Posted: Fri Jun 18, 2010 4:07 am Subject: Thanks Forum: DIY Hardware and Software
slabman Replies: 7 Views: 3257	Big thank you, dingebre, for taking this on. Huge thank you to Mr Steiner for understanding that open sourcing his historical intellectual property in this generous way benefits the community, and can ...
Topic: Delay/reverb/echo
slabman Replies: 5 Views: 6142	Posted: Thu May 20, 2010 7:00 am Subject: Delay/reverb/echo Forum: DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
slabman Replies: 5 Views: 6142	For an echo/delay, you'll need to clock the flip-flops, and each one will delay the incoming signal by one clock cycle. Let's say you have very lo-fi clock signal (thus sampling rate) of 6Khz. You'd n ...
Topic: Recycling Organs
slabman Replies: 4 Views: 2050	Posted: Tue May 11, 2010 3:07 pm Subject: Recycling Organs Forum: DIY Hardware and Software
slabman Replies: 4 Views: 2050	Not so much an organ as a source of spare part goodies - that expression pedal is crying out to be made into an FX pedal...
Topic: Developing my CMOS organ concept...
slabman Replies: 31 Views: 28981	Posted: Tue May 11, 2010 1:16 pm Subject: Developing my CMOS organ concept... Forum: DIY Hardware and Software
slabman Replies: 31 Views: 28981	I guess the single biggest source of problems is the keyboard - this is where biggest culprit in generating clicks, induced AC hum, crosstalk & so on. That's why more modern organ designs only put ...
Topic: Developing my CMOS organ concept...
slabman Replies: 31 Views: 28981	Posted: Tue May 11, 2010 9:26 am Subject: Developing my CMOS organ concept... Forum: DIY Hardware and Software
slabman Replies: 31 Views: 28981	If you want to solve all the usual organ problems (noise, crosstalk, bleed) then you'll end up building a conventional organ with all that that implies in having keying circuitry and so on. If you wan ...
Topic: Availability of NEW Curtis chips?
slabman Replies: 3 Views: 3096	Posted: Fri May 07, 2010 5:23 am Subject: Availability of NEW Curtis chips? Forum: DIY Hardware and Software
slabman Replies: 3 Views: 3096	It's a PA397 from OnChip. The forum linked to below says -It's basically a 3396 with stereo outs. It's now a 28 pin chip instead of the 24 pin package that the 3396 came in. In reasonable quantities ...