and is of course safety earthed (before anyone asks).
Heh, that one is visable in the top image.
Nice box - at first wondered what the yellow output was for, but then realized that there is just one ground connector - probably. _________________ Jan
also .. could someone please turn down the thermostat a bit.
Thanks, but no, the opamp before the LED is a comparator and the purpose of the offset opamp is twofold: it is there to enable the use of the zener diodes.
By applying a buffer connected to the wiper of the offset pot, the impedance as seen by the zener diodes is 100k / 4 = 25k independent from the positions of the wipers. If I didn’t use buffers there, turning one wiper would influence all other offsets.
Secondly, by using a buffer the impedance as seen from the -input of U1B does not change by moving the wiper of the offset pot, so the amplification by U1B is constant and unaffected by the position of the offset wiper. _________________ my synth
I haven’t been able to make a smooth transition from one setting of the LENGTH potentiometer (the only potmeter measured by the blue pill) to the other, so creating a cv input was not feasible.
Perhaps if I have time to spair in the future I will have a next look and maybe a next iteration of this module.
The blue pill is used for its speed, but the ram was insufficient for practical delay times so I added external memory for a total of 2MBit.
In addition I used a 16 bit ADC and a 16 bit DAC.
Alas, the ADC of the blue pill is only 12 bits, so each smallest step of the LENGTH potmeter will lengthen or shorten the delay by 32 samples
(32 samples x 16 bits x 4095 = 2MBit)
Joined: Jan 14, 2010 Posts: 5376 Location: Moon Base
Audio files: 699
Posted: Mon Jun 06, 2022 5:21 am Post subject:
I finally finished something (after waiting about 5 months to get some pots) ; a modified SIMA Edit 2 video enhancer.
You can see some of it in this video though my capture device + compression doesn't leave much of it intact.
It was also used for this video but that one also relies heavily on the Edirol V-4.
I also finished some video modules but I don't have any powercables and since I can't use them it doesn't feel like they are finished.
I might take some photos anyway but then I want to add more info + schematics aswell.
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