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If the voltage goes much higher than 9V, the Zener goes over, trips the SCR into shunting and the PTC resettable fuse opens and does it relatively fast, protecting the 1044 IC.

TC1044 has 12V max input..
Any PS of 9V nominal output capable to go over 12V is a REALLY BAD PS.. :icon_wink:
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Building your own stompbox / Question about usage of crowbar circuits
« Last post by bushidov on Today at 08:31:51 AM »
Hi all,

So, I was playing on my breadboard this little circuit that I whipped up:


It works perfectly fine in regards to it does its job. If the voltage goes much higher than 9V, the Zener goes over, trips the SCR into shunting and the PTC resettable fuse opens and does it relatively fast, protecting the 1044 IC.

I was curious to know why I don't see this circuit in guitar pedals that need that kind of over-voltage protection? I hear people with 1044 charge pumps putting in Zener diodes, but they just blow the zener completely, requiring it to be replaced.

I'm sure there is probably some reason. BOM count, or PCB real estate maybe? Your thoughts?
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Why buy parts and go through the trouble of breadboarding stuff if it's not going to work anyway?

Just to feel same *&^*&^ like the one from who you wish to get an answer..!!
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Building your own stompbox / Re: My phase 90 clone isn't working
« Last post by snow123 on Today at 08:18:50 AM »
i have random readings when i first short the leads together and after a few seconds in goes to 0, and i have nothing in between p4 and p5

Interesting result, now do the same test but between pins 4 and 6, then between 5 and 6. Let us know what you find.

Also, would you be able to upload a picture of your multimeter showing the test lead connection options.




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Why buy parts and go through the trouble of breadboarding stuff if it's not going to work anyway?
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 Box, did you have any problems like this with your build?
Quote
Please follow this reply:
Reply #32 on: June 27, 2021, 07:28:34 AM
my effect working without any issue.
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Digital & DSP / Re: School me on fvduino
« Last post by changes on Today at 06:55:23 AM »
sure, you can find the programs in spinsemi.h

BTW, if you are interested, there was a similar project using an ESP2866 that enabled using wifi to upload programs to FV1 using the same approach of emulating en EEPROM.

https://www.diystompboxes.com/smfforum/index.php?topic=126087

Thank you potul!

I think I saw that mentioned in a post but always thought it would be a harder project to take on, at least for me. I might give that a try as well though
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Breadboard IS your buddy..!!!
(more than any simulator in most cases..)
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Anyone? I have read the specs of the LM13700N and it would appear that they could be up to the task, provided the differential voltage is kept low.
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Building your own stompbox / Re: Aion Rift - increasing the volume.
« Last post by antonis on Today at 06:14:41 AM »
I have used the Wattson values for R26 through R29 on several Super-Fuzzes now, with excellent results for increasing the output without changing the pedal's basic response or tone:
R26 750K
R27 75K
R28 24K
R29 1.2K

No problem for Ge clipping diode pair, marginally Ok for Si but potentially bad for any LED.. :icon_wink:
(IMHO, happines of Q6 as a transparent booster with 820mV Base bias is strongly dependent on particular BJT specs, working temperature and particular Collector current..)
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