Fred Briggs - Super OCD

marssound · Post by **marssound** » 16 Jan 2013, 12:47

I want to make the vero board version and did a dubble-check:

I found mistakes I think. there is an electrolytic capacitor of 47 uF. right-top of the vero board.

in the orginal schematic it's placed between ground and +9V and leads to a resistor of 100K. and then to PIN 8 of the IC.
on the vero board it goes from ground directly to PIN 8.

almost the same happens with a resistor of 15K. the one next on the left from the 47 uF capacitor:
on the vero board it comes from Vr and goes directly to PIN 8.
on the original schematic there is the 100K resistor in between.

some people made this ver board version without any problems...so it is maybe not so important but I really want to
make a good working super OCD. the one that Briggs has made originally..

Post by **azrael** » 16 Jan 2013, 19:37

that's not 100K, it's a 100R (100 ohms) current limiting resistor. it's still on the vero.

condorface · Post by **condorface** » 17 Jan 2013, 02:26

Marsound,

Check again. There is no error. 9v connects to one side of the 100r resistor. The + lead of 47uf and the otherside of the 100r resistor are then connected to pin 8 (along with one side of the 15k resistor). Unless there are other schematics and layouts then the two I have seen in a quick skim of this thread.

marssound wrote:I want to make the vero board version and did a dubble-check:

I found mistakes I think. there is an electrolytic capacitor of 47 uF. right-top of the vero board.

in the orginal schematic it's placed between ground and +9V and leads to a resistor of 100K. and then to PIN 8 of the IC.
on the vero board it goes from ground directly to PIN 8.

almost the same happens with a resistor of 15K. the one next on the left from the 47 uF capacitor:
on the vero board it comes from Vr and goes directly to PIN 8.
on the original schematic there is the 100K resistor in between.

some people made this ver board version without any problems...so it is maybe not so important but I really want to
make a good working super OCD. the one that Briggs has made originally..

marssound · Post by **marssound** » 17 Jan 2013, 09:39

ok, here is what I mean:

marssound · Post by **marssound** » 17 Jan 2013, 09:41

azrael wrote:that's not 100K, it's a 100R (100 ohms) current limiting resistor. it's still on the vero.

ok, thanks!
my mistake...I saw a K instead of R on the original schematic...

condorface · Post by **condorface** » 17 Jan 2013, 09:58

Marsound,

It looks like you are reading the 9v and pin 8 points on the schematic backwards. On the schematic, the Point marked "V in" is connected to the + terminal of your battery or wallwart. The point marked "V+" on the schematic is connected to the other V+ point on the schematic, which is on Pin 8 of the IC.

marssound wrote:ok, here is what I mean:

beedotman · Post by **beedotman** » 17 Jan 2013, 10:08

condorface wrote:Marsound,

It looks like you are reading the 9v and pin 8 points on the schematic backwards. On the schematic, the Point marked "V in" is connected to the + terminal of your battery or wallwart. The point marked "V+" on the schematic is connected to the other V+ point on the schematic, which is on Pin 8 of the IC.

That's correct, sir!

marssound · Post by **marssound** » 17 Jan 2013, 10:20

Wow, thanks, you're right!

I am not gonna say: "stupid me!" I have somtimes serious concentration problems. see/read only 'half'.

then the vero board is OK and I will start to build.

my plan was to put a switch for switching 10 and 15 K resistor near PIN 1.
and a rotary switch with different capacitor-values (3 different values) for the TONE-control.
good or bad idea?

condorface · Post by **condorface** » 17 Jan 2013, 10:29

No biggie, we all have our moments. For instance, I misspelled your name twice. I have an OCD V4, and wish it had an actual tonestack, because it seems pretty limited as is. I little bright for my strat, but when I turn the tone down, I lose definition. I don't think a rotary switch would work though, because it still is a simple filter. Oddly enough, I think it may just need a lower input or output cap to turn down the mud, and then I would probably be happier with the tone control turned down.

marssound · Post by **marssound** » 17 Jan 2013, 10:58

Fred Briggs his version is different, and has for example a differrent tonecontrol.
I was hoping he changed it to something better.

I will make this pedal and try different capasitors and resistors there...(if it works)

beedotman · Post by **beedotman** » 17 Jan 2013, 15:32

Just use sockets to try different resistors and caps, and then solder preferred value.

deeno · Post by **deeno** » 15 Mar 2015, 19:35

a present for you!

not verified but checked with schematic and seems to be ok!
all pots in this version!
Fits in 125B box perfectly
ciao!

deeno · Post by **deeno** » 14 Apr 2015, 14:08

NOW VERIFIED!
works great!
tons of volume

deeno · Post by **deeno** » 20 Apr 2015, 17:23

ended!
hand painted my "AracnoDriver"

pomo · Post by **pomo** » 17 Jun 2015, 15:02

Hi Guys,

I'm ordering parts to build the Briggs Super OCD. Anyone have any suggestion on the MAX1044 IC? Would something like this work:

MAX1044CPA+

Thanks!

deeno · Post by **deeno** » 18 Jun 2015, 09:41

pomo, 1044 work fine
i normally use the ICL7660SCPA

pomo · Post by **pomo** » 18 Jun 2015, 12:26

Thanks so much. I tried zooming in on your pictures but still really couldn't make out the numbers on your IC.

I'll post pictures once I'm done with the build. Thanks for sharing your pcb!

deeno · Post by **deeno** » 18 Jun 2015, 13:05

great pomo, post the results here!
I'm curious to see how it will be!
Thank you for choosing my project

etartakovskiy · Post by **etartakovskiy** » 26 Aug 2016, 09:26

Hi Fred!
I've built the Super OCD by your schematic.
It's almost works, but I have an issue with gain pot: if I turn gain more 25% I hear crazy squeal and it disappear if I playing anything at guitar or touching pot and guitar strings. I'm out of thoughts how to fix it. Can you help me with advice?

Rocket Roll · Post by **Rocket Roll** » 01 Oct 2018, 08:22

Here are the working voltages (I've used deeno's PCB).

: FredBriggsOCDWorkingVoltages (1).jpg (17.44 KiB) Viewed 4291 times

: FredBriggsOCDWorkingVoltages (2).jpg (13.36 KiB) Viewed 4291 times