Search found 517 matches

by rowman
Sun Dec 01, 2013 10:10 pm
Forum: General Gear
Topic: Nord Modular OS Maverick
Replies: 27
Views: 14789

If the pots are voltage dividers, then they are just sending voltage signals, so couldn't you just input CVs directly? I'm far from an expert, but I thought vactrols were for when you needed voltage controlled resistance specifically. edit: woops, read ersatzplanet's post properly, vactrols are the ...
by rowman
Sat Nov 16, 2013 10:27 pm
Forum: Artist Discussion
Topic: The Necks
Replies: 24
Views: 2077

Love the Necks, looking forward to their annual show in Feb.
by rowman
Mon Jun 17, 2013 4:40 am
Forum: Music Tech DIY
Topic: CLOSED: FSR-402 Group Buy
Replies: 57
Views: 4129

Forgot to say that I got mine, they came a week or two ago :mrgreen: Got the refund and everything, thank you so much for organizing this operation! I hope you aren't out of pocket at all. Unfortunately(?) I'm about to go travelling for 5 months so I won't be building anything with these in the near...
by rowman
Mon Jun 17, 2013 3:41 am
Forum: Music Tech DIY
Topic: [SOLD OUT] : Quad VCA-Mixer (THAT2181 based)
Replies: 566
Views: 48085

Finally built my QuadVCA mixer, it's now the center of my system, thanks L-1!

Also I was able to trim for almost x2 gain without mods.
by rowman
Tue Jun 11, 2013 5:38 am
Forum: Music Tech DIY
Topic: [New Information Page 7] 258J PCBs (August/September Run)
Replies: 201
Views: 16774

Got mine, thanks for resending them!

I've got them built and one wired and working, such a ripping FM.
by rowman
Thu May 23, 2013 8:23 am
Forum: Music Tech DIY
Topic: Tayda Electronics?
Replies: 27
Views: 6166

The super thin resistor legs have come in handy putting multiple leads into one hole when doing stripboard :tu:
by rowman
Wed May 15, 2013 11:29 pm
Forum: Music Tech DIY
Topic: [Project] Random Looping Sequencer / Turing Machine
Replies: 1463
Views: 133025

I had the same problem as futuresoundsystems, only adding 5V into the CV wouldn't help. I tried adding parallel resistors to the feedback of the noise section op-amps, but it wouldn't reduce the noise to below 24v p-p on the scope :confused: . I had to add a 22k in series with R30, this reduced the ...
by rowman
Wed May 15, 2013 6:51 pm
Forum: Music Tech DIY
Topic: [PCB] Thomas Henry's 555-VCO, 2nd run! check PMs
Replies: 1035
Views: 130483

I've build both of my kits, and they both work great! A quick fiddle of the trimmers got it to track the entire range of my midi keyboard well enough to my ears. I would like to add that I LOVE this method of building modules with connectors between the boards. It even inspired me to use them to sta...
by rowman
Fri May 03, 2013 2:38 am
Forum: Music Tech DIY
Topic: THAT Corp - SHIPPING TIME!
Replies: 241
Views: 19575

Got mine in Australia, cheers!
by rowman
Mon Apr 29, 2013 8:25 am
Forum: Music Tech DIY
Topic: CMOS voltage question
Replies: 16
Views: 1626

Another way to center the outputs around 0V is to use an opamp comparator. The opamp will swing from +12V to -12V, follow this with a simple voltage divider to bring it down to +/-5V. This also serves to buffer the outputs of the CMOS chips like daverj suggested. With this scheme, it doesn't matter ...
by rowman
Sun Apr 28, 2013 7:44 am
Forum: Music Tech DIY
Topic: CMOS voltage question
Replies: 16
Views: 1626

If I were you I would just run your circuits off 12V and ground. You should be able to patch the signals anywhere you want. If you're really worried about offset and AC coupling, you can put a capacitor in series with an output for audio, around 220nF. Some mixers may already have this on the inputs...
by rowman
Sun Apr 28, 2013 7:28 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

Thanks Rowman.. you're a king amongst men.. ;) On a slightly different subject - would wiring the start switch permanently open (in the AND clock reset circuit) start a standard Baby 10 from step 1? I'm not quite sure what you mean. In the schem you posted above for the start switch, if it's perman...
by rowman
Fri Apr 26, 2013 9:30 am
Forum: Music Tech DIY
Topic: CLOSED: FSR-402 Group Buy
Replies: 57
Views: 4129

Paid for 10.
by rowman
Fri Apr 26, 2013 9:21 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

Here is a layout for board 2 where reset holds it to the last step, rather than the first. Basically just a shuffle of the diodes, so that the patterns are shifted forward one step, so the first step for the 4017 becomes the last step in the sequence. Instead of sometimes skipping the first step, bu...
by rowman
Tue Apr 23, 2013 8:40 am
Forum: Music Tech DIY
Topic: [New Information Page 7] 258J PCBs (August/September Run)
Replies: 201
Views: 16774

Was I one of those last 5 or 6?
by rowman
Tue Apr 23, 2013 7:02 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

:doh: :doh: :doh: Totally messed up my thinking in my last post. You will definitely be missing the first beat of the sequence sometimes with this switch arrangement. Asthmareport's method will work great as long as the start signal is exactly in time with the clock. If you use a manual switch, the ...
by rowman
Sun Apr 21, 2013 2:56 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

Any thoughts on adding a start/stop switch that reset the 4017 in the off position? So it would be "UP" = start, "DOWN" = stop, reset. You could, but it would be a pain and you would end up with exactly the same behavior you would get by adding Asthmareport's switch circuit to the Beats module. Bas...
by rowman
Sat Apr 20, 2013 12:07 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

I think in sequencers when the logic output for a stage is held up as long as the stage is active it's called a Gate, whereas the clock signal would be considered triggers. If this is what your talking about, then the outputs of the 4017 are gates, but the outputs of the Beats module are triggers si...
by rowman
Fri Apr 19, 2013 11:04 pm
Forum: Music Tech DIY
Topic: [SOLD OUT] Eurorack panels for the CGS/Serge Resonant EQ
Replies: 374
Views: 29238

Got one of mine going, love it. LOVE IT.

Turning up feedback just before the point of ringing sounds like the ringing of a small acoustic space, I wonder what it sounds like with a few ms of delay in the feedback line...
by rowman
Thu Apr 18, 2013 7:48 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

I changed the layout for board 2, now the outputs are only on when the Clock is high. This fixes the problem of missing the first beat. I did it using diode logic, so I only added a few diodes and resistors, but it's getting pretty cramped with components over the top of other components. The layout...
by rowman
Thu Apr 18, 2013 7:07 am
Forum: Music Tech DIY
Topic: [Closed] Dual digital oscillator ordering
Replies: 756
Views: 69652

Ordered, holding off on the panel though.

I'm going to wait for the Clarke panel to go with my 258j 'Dual Analog Oscillator' panel. :party:
by rowman
Tue Apr 16, 2013 4:59 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

Nice idea with the start input Asthmareport, that start switch will be a great addition. If you wire the reset pulse from the start switch (after the gate-to-trigger and inverters) to the switch pin of the reset jack, then you can override the reset function of the switch. This enables you to sync t...
by rowman
Mon Apr 15, 2013 7:50 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

Have you had any problems with starting in sync, missing the first kick, etc? I've heard people saying the baby10 style sequencers miss the first beat because reset takes it back to 1 and when you send it clock, the first thing you hear is beat 2.. Hmm, I guess it depends what you want to do. If yo...
by rowman
Wed Apr 10, 2013 6:31 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

Dubka wrote:So, the TL074 is your onboard clock?
Yeah, it's basically the same as an inverter oscillator. The 10M resistor adds hysteresis to the comparator to make it a schmitt trigger like the 40106.
by rowman
Tue Apr 09, 2013 9:15 am
Forum: Music Tech DIY
Topic: DIY clock/trigger
Replies: 58
Views: 4426

https://www.muffwiggler.com/forum/userpix/6937_beats_module_1.jpg So I built one. On Tayda stripboard. I decided to buffer the inputs to the 4017 (took the input conditioner from the schematic of the Random Looping Sequencer, thanks Tombola). Buffering clock, reset and hold there was a spare op-amp...

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