Just built small clone, but got a question.

[jmdfd415]

I built the small clone chorus from tonepads layout earlier and it worked right away.  The only mod I did was the depth pot.  When I started playing I noticed that it seemed kinda subtle.  I was hoping for a sound like analog mans chorus, but mine is alot more subtle than that.  I followed all parts from the tonepad layout except I didnt have enough 1uf electros so I used 2 1uf tantalums instead, and the parts list says to use a 100pf but as I was building I noticed that the layout calls for a 150pf.  Would these changes cause the effect to be subtle?  Or are there some mods I should do to make it more pronounced? 

[Pushtone]

I haven't hear an Bi-Chorus but I can say the TP Small Clone should give you lush chorus as in swimming in it.
Don't think this can be subjective. The effect is very pronounced.


You got your trimer tuned up to where it's chorusing?
The RATE pot is working correctly from slow to fast?
You've double checked the DEPTH pot wiring?
You've checked the orientation of the IC in the LFO section?
You've double checked the part values around the DEPTH pot in the LFO section?
You've checked the voltage swing coming off the LFO?

I can meter my SC and post the IC pin voltages.



I noticed the thing with the 100pf in the BOM and 150pf in the schem too.
I went with the value in the schem, 150pf I think. I doubt thats your issue.
I also doubt the tantalum caps make a different, where in the signal path are they used?


Try a buffer before the SC to see if that brings out the effect. Just an experiment.

Take a break and listen to it again in the morning before making any changes!

[jmdfd415]

I tuned the trim pot right after I had started playing and found the sweet spot.  Rate pot works fine.  All wiring is correct.  All ic are placed correctly.  All part values look correct.  I just checked the voltages so maybe there is just something little I am missing and maybe these will help.  So here are the voltages:

IC1:  LM358
1: 1-2.8 constantly moving    8:  8.44
2: 3.83                                7: 0-7.12 constantly moving
3: 3.80                                6: 2.08
4: 0                                    5: 1.4-3.0 constantly moving

IC2:  jrc4558
1: 4.22                             8: 8.43
2: 4.22                             7: 4.21
3: 4.12                             6: 4.21
4: 0                                 5: 4.20

IC3: MN3007
1: 7.78                             8: 4.71
2: 3.91                             7: 4.70
3: 5.05                             6: 3.91
4: 0                                 5: 0

IC4: CD4047
1: 7.54-7.59 constantly moving      14: 7.77
2: 0.12-0.16 constantly moving      13: 7.59-7.61 constantly moving
3: 6.79-6.81 constantly moving      12: 0
4: 7.77                                        11: 3.90
5: 7.77                                        10: 3.90
6: 7.77                                         9: 0
7: 0                                             8: 0

Q1: 2N5087
e: 0
b: 3.92
c: 4.53

Q2: 2N5088
e: 4.03-4.06 constantly moving
b: 4.59-4.62 constantly moving
c: 8.42

Q3: 2N5088
e: 7.75
b: 8.38
c: 8.42

Battery is at 8.78 volts.

[H.Manback]

Try audio probing the point marked with "D" in this schematic: http://www.tonepad.com/getFile.asp?id=97

This is before the wet/dry mix (the 20k and 22k resistor which go to a opamp buffer), and you should hear the pitch going in a up/down cycle very clearly. Also, compare the volume of the signal at that point, and the point before the 22k resistor which comes from the input opamp. If the difference is too big, you won't hear the wet signal coming through very well when it's mixed.

[jmdfd415]

Fixed it!!   I checked where you said and I guess there was a weak solder so I hit it with the gun real quick then tried it out and now it sounds awsome!  Thanks for the help guys!