Yay for success. Treatments can really mess with the mind, can't they.
KenOn Tue, Oct 3, 2017 at 8:55 PM, Paul Bower paul@... [cgs_synth] <cgs_synth@yahoogroups.com> wrote:Success
I was trying to figure out how the hell the column LED would light but the jack wouldn’t output the pulse, then (after fixing a couple of dry joints that broke from repeated dismantling) I realised that if the output was shorting to the chassis, but the ground cable wasn’t… …then… …maybe… …i got the wires backward… …Yup the pulse output wires for that stage were backwards, but the LED wires were correctCan’t believe it took me that long to figure out - I’m definitely blaming the chemo on this oneThanks for your help & patience as always KenHope things are good over thereCheersPaulOn 3 Oct 2017, at 09:11, Paul Bower paul@... [cgs_synth] <cgs_synth@yahoogroups.com> wrote:Phew - thanks for confirming that
Later boards only needed 6 links because I found a way to eliminate the outer links.KenOn Tue, Oct 3, 2017 at 12:22 AM, Paul Bower paul@... [cgs_synth] <cgs_synth@ yahoogroups.com> wrote:Just want to check something on the switchboard - I have a board that has only six wire links marked on the silkscreen - the inner six links between the rows of switches
I realise on the current documentation that there are a further six wire links on the edges of the board. My PCBs don’t have Rev numbers, but am I right to assume these are earlier boards that don’t require me to figure out the extra six links ?Just to re-iterate, apart from the column output weirdness (partially fixed by poor connection on an LED) that Gate Sequencer has been working fine for a number of monthsCheersPaulOn 2 Oct 2017, at 08:46, Paul Bower <paul@...> wrote:Okay, that’s sort of good to know - dry joints - and I used to be so good at soldering :-)CheersPaulYou have a bad jack or have miss-wired it, or perhaps you have broken the pad where the wire is soldered from the PCB. I can't think of anything else that would cause this problem.On Mon, Oct 2, 2017 at 3:47 AM, Paul Bower paul@... [cgs_synth] <cgs_synth@yahoogr oups.com> wrote:…Sorry, forgot to add: The end column Full & Pulse outputs for all eight steps on all four rows are just fine
Hello there,
I’m fairly certain this was all working fine, but yesterday I realised that the Step Out on Step 5 wasn’t working. It may have been like that for some time because strangely the LED was working just fine, just no output at the jack. I checked everything on the main board, replaced the BC547, then realised that the LED wouldn’t light either under certain switch conditions for that step and the previous step - which I’m certain I would have noticed. After an afternoon of power off/try something/power on cycles, the problem has spread to Step Two - so I’m wondering if the 4017 might be on it’s way outGot to order a 4017, and I hate desoldering, so I’m wondering if you’ve any thoughts ?BTW I tried cutting loose my extra capacitor, per the reset fix below, but that didn’t make any differenceCheersPaulOn 25 Jun 2017, at 10:47, Ken Stone otherunicorn@... [ cgs_synth] <cgs_synth@yahoogroups.com> wrote:It would miss an entire step if it was a problem.On Sun, Jun 25, 2017 at 7:23 PM, Paul Bower paul@... [cgs_synth] <cgs_synth@yahoogr oups.com> wrote:You mean a kind of lag between the reset event and the clock advancing to step 2 / step 3 etc ?
I’ll check for that - I just tacked the extra cap on the back of the board, so it’s not so much of a faff to try some lower valuesOn 25 Jun 2017, at 10:17, Ken Stone otherunicorn@... [ cgs_synth] <cgs_synth@yahoogroups.com> wrote:The only "issue" having the reset cap to big is that it may prevent a clock pulse from advancing close to when the reset occurred.On Sun, Jun 25, 2017 at 6:42 PM, Paul Bower paul@... [cgs_synth] <cgs_synth@yahoogr oups.com> wrote:Good to hear from you Ken - hope things are good over thereSince that’s all I had, I just put a 47nF cap across the existing 10nF and that did the trickIn case anyone else comes across this, it was a very old board. I could get the gate sequencer to reset from its own 12V step outputs, but not from an LFO that was sending a 0-8.5V squarewave (and certainly not from a variety of things I tried at around the 5V mark)So all fixed - I can reset on a 4.5V pulse nowI assume that if I get misfiring problems now then I just need to reduce the value of that bridging cap a little ?CheersPaulOn 25 Jun 2017, at 02:21, Ken Stone otherunicorn@... [ cgs_synth] <cgs_synth@yahoogroups.com> wrote:I should work that way already. Perhaps increase the size of the 10n reset cap to 47n to let a bigger pulse through.
On Sun, Jun 25, 2017 at 6:44 AM, Paul Bower paul@... [cgs_synth] <cgs_synth@yahoogr oups.com> wrote:Hello there,
Just wondering if anyone could recommend a way of modding the reset input to accept +5V instead of +12/13VCheersPaul
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