Ok, you got your soldering iron and nothing is going to hold you back, but you have no clue where to start or what to build. There were others before you with the same questions... read them first.
So far I have ordered some parts that I think are the needed for the build. Here is the list.
If anyone spots something that is not usable or the wrong type of... it will be appreciated.
pieces Products:
6 x 2N5088
2 x FKP2 220pF 630V
10 x 22uF/63V radial
6 x Panasonic FC 4,7uF/100V
2 x MKT 10nF
2 x MPP 10nF
4 x ECQ-V 0,1uF 50V
2 x SMF 0,22uF 50V
2 x MKT 0,22uF
5 x 33k metal film 1%
5 x 5k6 metal film 1%
10 x 39k metal film 1%
5 x 180k metal film 1%
4 x 3k9 metal film 1%
5 x 12k metal film 1%
5 x 470R metal film 1%
5 x 150k metal film 1%
5 x 1k2 metal film 1%
5 x 4k7 metal film 1%
5 x 120k metal film 1%
1 x stripboard 100x160mm
2 x Alpha Potentiometer 16mm 10k rev log
4 x Alpha Potentiometer 16mm 100k lin
2 x Alpha Potentiometer 16mm 100k audio
Hi there.
I buildt a CSPB Later version : sounds great
Used 3 x BC 182L ( 280-340 hfe) pinout BCE ....
it fits nicely into the vero layout .
To set up BIAS I used a 100K trimpot instead of 120K (Vcc-Q1 col).
With 56K I got 7.5 V Q1 . On Q2 I went with stock value (1.8K) and Q3 I went with 5.6 K .
I use 18V power supply. Good luck with your build.
/cheers M
No : it´s instead of 120K resistor : the far left resistor in your picture: it connects Q1 C(collektor) with
power rail 18 V at the bottom of the vero layout.
/cheers M
Trimpot pin 3 goes to +18V
pin 2 goes to Q1 collector
pin 1 no connenction( or connect to pin 2).
Dial in right voltage and take a reading between
pin3 and pin2 with a OHM meter : and you can then replace
trimpot with a fixed resistor value.
You could also use a regular pot (100K LIN).
On Q3 you kan use a 10K trim to get right bias :
same setup with pin 3 to +18v and pin 2 to Q3 col.
/cheers m
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Last edited by guitarmongot on 25 May 2012, 19:04, edited 1 time in total.
You connect 2 of the lugs. There should be 2 "side" lugs and one "middle" lug. Connect either side lug to the middle lug. Now you only have 2 connections to the trimpot. You now have a variable resistor. This is illustrated on this page here: https://www.diystompboxes.com/cnews/mods.html. Its the first hand-drawn image on the page. They show it using a pot, but you can do the same with a trimpot. Hope that helps.
Note: that page is an awesome reference to start you making your own mods to circuits. I would suggest reading through it a couple times. It helped me a lot.
Edit: guitarmongot beat me to the answer, but my info might help too.
the vboard is small smaalll ....
I was thinking I can make the cuts on the fly - 3 attempts later I gave up and flipped the image, made the cut points huge red dots and finally made it through ...
soldering on tricky for a beginner - I got some leakage to the neighboring strips I tried vacuuming off the excess solder and running exactoknife between the strips- no idea if that helped as my multimeter is broken.
also I skipped 1 resistor from my order ... so yeah this is going to wait.
if it works it's gonna b a miracle
Just hang in there : it´s a great pedal with lots of MOJO vibes in it ....
Think Jeff Beck;David Guilmor and a hole lotta others early 70´s great players...
And a small tip : often you can buy a hole sets of common resistors : http://www.smallbearelec.com/servlet/Detail?no=1027
you´re gonna need them for your next bulidt:and your next, and your next,.....
/cheers M
the vboard is small smaalll ....
I was thinking I can make the cuts on the fly - 3 attempts later I gave up and flipped the image, made the cut points huge red dots and finally made it through ...
soldering on tricky for a beginner - I got some leakage to the neighboring strips I tried vacuuming off the excess solder and running exactoknife between the strips- no idea if that helped as my multimeter is broken.
also I skipped 1 resistor from my order ... so yeah this is going to wait.
if it works it's gonna b a miracle
Strip Board (Vero) is a harsh mistress my friend. I only use Vero when I am building one off pedals or when I am tweaking a circuit before committing it to a PCB. Best thing to do is go REALLLLLY SLOOOWW when soldering and clean between the tracks after EVERY solder joint. I find that when I slow down and really pay attention to being super neat with my solder joints the Vero builds work the first time, but if I hurry---I am trouble shooting the board for hours to days LOL.
"Ever wondered how some of your favourite guitar players got their tone? Me too. Probably a good amp and lots of practice." Little Lord Electronics Homepage
I always take a superfine sandpaper and goes over the copper rails side and then use cleaning liqour or
a cotton cloth. Also put the top of your soldering iron tip direct to the rails and heat it up for 2-3 sec.
then applay just a little soldering and let it float out nicely (2 sec)..
Take a close look and if you need more soldering : just repeat the process.
Best to clean between rails IMHO is a : http://www.smallbearelec.com/servlet/Detail?no=383
use a very small size 2-3mm ...
And as mentioned erlier : take your time : debugging takes 10x times than soldering....
/cheers M
If it is a blobby, sloppy mess--use the desoldering braid and remove all the solder and start over on that joint. I use a box cutter (razor) to clean between the tracks.
"Ever wondered how some of your favourite guitar players got their tone? Me too. Probably a good amp and lots of practice." Little Lord Electronics Homepage