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gasboss775

Joined: Jan 02, 2016 Posts: 217 Location: Scotland
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PHOBoS

Joined: Jan 14, 2010 Posts: 5828 Location: Moon Base
Audio files: 709
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Posted: Sun Apr 23, 2017 5:00 pm Post subject:
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I am intrigued by your XOR gate, haven't tried to figure it out yet though. Are those actually zenerdiodes
and if so do they have the same voltage ? Sampling high frequency oscillators does indeed work well for
'random' especially when you throw a couple in the mix. A shift register with a high frequency oscilator
connected to the data input also works nice and you can attach a resistor network to it to create a semi-
analog signal. _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
SoundCloud BandCamp MixCloud Stickney Synthyards Captain Collider Twitch YouTube |
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blue hell
Site Admin

Joined: Apr 03, 2004 Posts: 24423 Location: The Netherlands, Enschede
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G2 patch files: 320
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gasboss775

Joined: Jan 02, 2016 Posts: 217 Location: Scotland
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Posted: Mon Apr 24, 2017 2:48 am Post subject:
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PHOBoS wrote: | I am intrigued by your XOR gate, haven't tried to figure it out yet though. Are those actually zenerdiodes
and if so do they have the same voltage ? Sampling high frequency oscillators does indeed work well for
'random' especially when you throw a couple in the mix. A shift register with a high frequency oscilator
connected to the data input also works nice and you can attach a resistor network to it to create a semi-
analog signal. |
The Diodes are Schottky diodes which have a lower forward voltage than regulars. Probably not strictly necessary here & I expect 1n4148's would work as well.
I tried your idea with the shift register in the past using a 4094 8 bit SR. I found there was a problem with the outputs being unsteady whilst the clock remained in the high state. That is the data was being routed through to the output whilst the clock was high rather than being sampled at the rising edge of the clock pulse. Maybe the problem is just with the 4094, I haven't tried other SR's yet. |
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PHOBoS

Joined: Jan 14, 2010 Posts: 5828 Location: Moon Base
Audio files: 709
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Posted: Mon Apr 24, 2017 4:49 am Post subject:
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oh shottky diodes, that makes sense, I mixed up my diode symbols Yeah, regular diodes should do fine
but it's always good to keep the voltage drop to a minimum.
I am somewhat surprised it doesn't work with a CD4094 it even has an extra latch, I guess I should do some experiments
with it. It seems to work fine with a 4015, I like connecting one of those flickering teacandle LEDs to the data input.  _________________ "My perf, it's full of holes!"
http://phobos.000space.com/
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gasboss775

Joined: Jan 02, 2016 Posts: 217 Location: Scotland
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Posted: Mon Apr 24, 2017 12:02 pm Post subject:
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PHOBoS wrote: | oh shottky diodes, that makes sense, I mixed up my diode symbols Yeah, regular diodes should do fine
but it's always good to keep the voltage drop to a minimum.
I am somewhat surprised it doesn't work with a CD4094 it even has an extra latch, I guess I should do some experiments
with it. It seems to work fine with a 4015, I like connecting one of those flickering teacandle LEDs to the data input.  |
I wonder if I had a bad batch of 4094's as I'm sure that I tried more than one. I do have a few 4015's so I'll give this a go.
Where do you get the flickering teacandle LED's, I haven't seen those before? |
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PHOBoS

Joined: Jan 14, 2010 Posts: 5828 Location: Moon Base
Audio files: 709
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