ehx bassballs

[joer0952]

Hello,  built a bassballs today from the layout on the topopiccione electronics website: http://topopiccione.atspace.com/PJ08EHBassBalls.html  The followed the component layout exactly the 1458 I used is lm1458 although it has ha17458 written on it:
http://www.taydaelectronics.com/servlet/the-1998/LM1458-HA17458-1458-DUAL/Detail
its wield when I plug it in I get sound if im on the switch side connected to the potentiometer and C2 but not when im on the switch side connected to R8-9.
Also when i do get sound it is only the guitar no envelope filter effect, although while I am turning the T1 trim pots i get a slight wah sound.
debugging data:
battery 9.5v
red lead on board = 8.21v
black lead on board = 0.0v
Q1 (2n5088) c = 8.2v b = 1.74v e = 1.16v
Q2 (2n5088) c = 0.0v b = 0.53v e = 0.0v
Q3 (2n5088) c = 0.0v b = 0.51v e = 0.0v
D1 (1n4148) A = 2.08v K = 1.73v
IC1 (1458):
pin 1 = 2.09v     pin 8 = 8.19v
pin 2 = 1.89v     pin 7 = 4.11v
pin 3 = 0.0v       pin 6 = 4.11v
pin 4 = 0.0v       pin 5 = 4.01v
IC2 (4558):
pin 1 = 4.07v      pin 8 = 8.20v
pin 2 = 4.12v      pin 7 = 4.07v
pin 3 = 4.11v      pin 6 = 4.12v
pin 4 = 0.00v      pin 5 = 4.11 v

below is the layout and schematic on the site any help in debugging this would be great thank you:

[mrslunk]

The bassballs is designed around the particular behaviour of the lm1458.
Most other op-amps (including the HA17458) won't work.
in short; get a real LM1458 (from futurelec, or some other place)
i've read that a lm358N also works

as an aside:
The reason it's specific to certian op amps is beacuse the envelope follower tries to push it's ouput voltage below the -ve rail.
Some op amps bottom out gracefully, (i'd assume thats what the 1458 does), most don't (especially the tl072's).

so; get an actual lm1458 (or a lm358n)
if that dones't work, then something else is wrong

[joer0952]

thanks for the reply.  I just ordered the ics from futurlec.com and will try it when they arrive.  Do you think that the problem with the switch is because of the wrong ic, i noticed that if i play my ipod through it (for signal testing purposes) i get a very low signal when I flip the switch (i guess the guitar is to low to hear it when i have my guitar plugged in) Also, do you think the readings on the transistors are normal, especially q2 and 3?

[mrslunk]

an lm1458 should make that work.
I think the 'fuzz' sounds like sh%t though so i left it out when i was messing around with it.

don't stress about q1-q3 until after you've got the right chip in there.

[Earthscum]

I've been finding that pretty much any op amp that is listed for single supply operation works pretty good. Like previously stated, LM358 worked, also the LM2904's I just got in worked good. I tried a NE5532 and had issues... like it was too sensitive, it would just open it al the way up, and then it didn't work, so I stuck the 2904 back in, worked fine.

So, IMHO, and I'm definitely no expert... just played around a little with it, it seems that "Single Supply" op amps are fairly interchangeable. I tried the 4558 and it didn't work all that great either, although I got it to work with some tweaking. It just doesn't "quack" like 741's and 1458's.

[Mark Hammer]

Yes, 359s can also work, though the 1458 works best.

[joer0952]

ok so i got the chips from futurlec, finally, and all but one is the exact same chip i had.  But for testing sake i put the one chip that said lm1458n on it into the socket and i get the same problem.  I get signal, but no effect, although i get a wah effect when i play and turn one of the trim pots, and the non distorted signal is very low.  any suggestions

[Mark Hammer]

That suggests you have a diode in backwards.

[joer0952]

the one diode (1n4148) is oriented in the way it shows on the layout and schematic.