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Post by audiojack on Jan 25, 2020 9:19:37 GMT
I have managed to sync this DIY clock source to the TOPGRAF, the TRIG164 and the SEQ16, but I have noticed that the gate of the clock source is too long to trigger the MM-DIVIDER. Here is the CAD and a pic of the circuit.
Where/How can I add another pots to change the gate length? I tried across R1, and that doesn't really work.
If I have this right, with the 555N in astable mode, the length of the gate is detemined by the time if takes for C1 to discharge, so I think that's the bit I need make varialble somehow.
Any ideas?
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Post by young Protoboard on Jan 25, 2020 10:33:35 GMT
My favorite IC! This is my favorite reference. If you have diodes then I'd recommend the right circuit on the "Fully Independent 555 Oscillator." " The right 555 on my clock module I think is more similar to your current setup, if I'm divining your breadboard correctly. That option has a sort of "maximum" pulse length determined by the 100 Ohm resistor. THat resistor and the 10k pot should vary in value based on your capacitor size, so play around with them. " EDIT: The above statement in quotes is bad advice and I apologize; I was thinking of a previous version of my module that actually had PWM capability when I recommended it. The 555 configuration in question does not have this capability; its pot only adjusts frequency. /EDIT Your diagram shows a 9V battery. Is that accurate, or is it a power placeholder? How is your power configured? |
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Post by audiojack on Jan 25, 2020 18:30:11 GMT
My favorite IC! This is my favorite reference. If you have diodes then I'd recommend the right circuit on the "Fully Independent 555 Oscillator." The right 555 on my clock module I think is more similar to your current setup, if I'm divining your breadboard correctly. That option has a sort of "maximum" pulse length determined by the 100 Ohm resistor. THat resistor and the 10k pot should vary in value based on your capacitor size, so play around with them. Your diagram shows a 9V battery. Is that accurate, or is it a power placeholder? How is your power configured?
Sorry, the 9V battery was on the diagram I used. I power it straight from the AEM power strip.
I'm going to look at your clock module.
I could just grab a ATTINY45 or something, but I really want to learn more about component electronics, so thank you so much for your help.
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Post by young Protoboard on Jan 25, 2020 23:27:50 GMT
I could just grab a ATTINY45 or something, but I really want to learn more about component electronics, so thank you so much for your help. I had the exact same thought when I started DIY! I spent a few days tinkering with an Arduino Uno and getting it to do different utility stuff; my first program was a combo clock+binary divider, and once I started adding a sequencer to it I had to sit down and think about what I really wanted to do with DIY. The Unos are still in my electronics kit, just tucked away for when I really need that much power. |
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Post by NightMachines on Jan 26, 2020 8:11:27 GMT
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Post by audiojack on Jan 26, 2020 10:41:20 GMT
These are very helpful.
So I had a look at the second one you posted.
Here is the schematic.
but I'm not very good with schematics. I need to translate them to a breadboard. Here is my attempt at doing that Have I got that right?
My fritzing skills aren't very good (and I can't seem to send components to back on my copy) Here is the diagram in fritzing format.
From the website, it looks like you can adjust the duty cycle, but can you adjust the time between pulses? Perhaps the circuit will need adapting for that.
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Post by young Protoboard on Jan 26, 2020 23:31:29 GMT
Here is the schematic.
From the website, it looks like you can adjust the duty cycle, but can you adjust the time between pulses? Perhaps the circuit will need adapting for that.
If my understanding of the circuit is correct, the timing capacitor C1 both charges and discharges through P1, which is a potentiometer configured as a variable resistor. So actuating P1 will change the period/frequency of the signal, and actuating P2 will change the pulse length. Oh, I just noticed that it's labeled on the right-hand side... Sorry, I'm blind. This circuit gives you control over frequency and duty cycle, like the AEM LFO. If you're looking for control over the individual on/off pulse duration, then this will require some modification. Such a configuration would work, but would have some limitation on frequency selection; for example, I imagine you would dial in the HIGH pulse length you're looking for, then adjust frequency via lengthening or shortening the OFF pulse. However, that pulse length won't vary with frequency-- it'll stay whatever length you set it to. So if you want to sweep to a quick frequency in a patch, you run the risk of your pulse train sort of merging together and eventually turning into a sort of DC voltage or PWModulated square wave with the pulse width set too high. For clock purposes, any of the circuits recommended here will work fine. Individual on/off pulse control would probably work just fine, too, and functions a little differently; it's personal preference as to which parameters you prefer to control. EDIT: An individual on/off length control setup will cause the frequency to vary when the pulse ON length is varied, which may cause some headaches. |
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