DIY multiFX power supply question (NeoVibe)

[mat]

I'm just getting my very long time multiFX project almost finished but would like to ask if the PS im using is suitable for the job. Attached is the schem of the PS. The PS feeds several -9V +9V effects on the unit just fine. The last effect I'm about to finish is the NeoVibe . I think many quess right that im having the old noise problem. Would it be possible to get the NeoVibe to work with the other effect with the same PS that the other effects use ?

[antonis]

<Maybe off-topic, but..>

When use an indicator LED (or more..) with dual supplies it's important that the LED (and it's current limiting resistor) to be connected between the supply rails and not to the artificial GND..
(espedially if you use OP Amps for Voltage regulation..)

[R.G.]

I think many quess right that im having the old noise problem.

You'll need to describe the noise problem better. There are many kinds of noise and all of them are old.

Would it be possible to get the NeoVibe to work with the other effect with the same PS that the other effects use ?

Yes. The simplest way is to remove the rectifier diodes from the input path on the Neovibe, pick which of the power supply pads will be positive and negative, and jumper across the empty diode pads to supply the incoming V+ and V- to the filter caps. Then feed the power supply pads +24V and ground from your supply, making sure that you have the polarity correct.

[mat]

Thanks R.G. for the answer, I'll get back soon. Still have some debugging to do- wrong voltages on the first transistor.

[mat]

I don't have diodes on the NeoVibe board. The 24V from PS is connected to one 1000uF and to 15V regulator on the NeoVibe board. The ground going to the vibe board is taken from 'GND' point of the PS. Should it be taken from '-' of the diode bridge instead ?

I have following voltages on the Q's

         C       B       E
Q1   .83     .22     .23  (something wrong in here)
Q2   .29     .83     .23  (something wrong in here too I suppose)
Q3  14.87  4.7     4.36
Q4  14.87  4.7     4.38
Q5  11.16  4.7     4.32
Q6  14.87  4.7     4.32
Q7  11.14  4.32   3.72
Q8  14.87  4.73   4.27
Q9  11.26  4.27   3.61
Q10 14.89 5.85   5.25
Q11 23.1   10.6     *          (*=changing)
Q12 23.1     *      11.4
Q-lamp 20  3.5    2.8

[R.G.]

I don't have diodes on the NeoVibe board. The 24V from PS is connected to one 1000uF and to 15V regulator on the NeoVibe board. The ground going to the vibe board is taken from 'GND' point of the PS. Should it be taken from '-' of the diode bridge instead ?

Nope. As long as you're getting the ground from your power supply connected to the DC ground of the 100uF cap on the vibe, you're OK. The power supply output ground connections are good as far as I can tell from your picture.

C       B       E
Q1   .83     .22     .23  (something wrong in here)
Q2   .29     .83     .23  (something wrong in here too I suppose)
Q3  14.87  4.7     4.36

Yep, something wrong there. The collector of Q2 should show the same voltage as the base of Q3 - they're connected by a copper trace. And the collector of Q3 should be about 4.5V lower than the B+ supply, which is at 14.87. With only these voltages to go on, it appears that there are some issues with either component placement, component pinout, or soldering.

[mat]

Thank you for the help. I'll examine Q1-3 closer tomorrow.