NE570 compander with bipolar power supply

[Yazoo]

I have been experimenting with a vibrato circuit which uses varistors using the circuit in Stompboxology vol. 5 No. 1 (figure 2 page 3) http://moosapotamus.net/files/stompboxology-vibrato-rama.pdf It uses a bipolar power supply. The problem is, despite using bypass capacitors and small value resistors to isolate voltage to the different parts of the circuit, I cannot get rid of the LFO thump. I wanted to try integrating an NE570 compander which is rated up to a maximum 24 volts. My bipolar supply is +12/-12 v. I wanted advice on how to connect the ground connections for the NE570. I assume +12v goes to vcc on the compander and -12v goes to power ground. Should links to ground through capacitors etc. go to bipolar ground (0 volts), or to -12v?

The vibrato I am getting is nice, if only I could get rid of the thump

[antonis]

Can't open your attachement but the general idea is ALL capacitors should have one leg linked to GND (0 Volts DC or AC..)
(exception for decoupling bi-polar supply caps where you can link both to GND or replace them with a single cap between + & - (Vcc & Vee).

[GGBB]

Can't open your attachement but the general idea is ALL capacitors should have one leg linked to GND (0 Volts DC or AC..)
(exception for decoupling bi-polar supply caps where you can link both to GND or replace them with a single cap between + & - (Vcc & Vee).

Not ALL capacitors. Series capacitors are excepted obviously.

I wanted advice on how to connect the ground connections for the NE570. I assume +12v goes to vcc on the compander and -12v goes to power ground.

I could be wrong, but I don't think you can run the NE570 from a bi-polar supply using Vcc and GND. The datasheet states "intended for use in single power supply systems" so I think you can only run it using +12V and GND.

[anotherjim]

I'm not sure how much of the original circuit you made, but note IC1 forming a power rail splitter for connection "B". To convert to bi-polar, IC1 isn't needed and "B" becomes ground.

[antonis]

Can't open your attachement but the general idea is ALL capacitors should have one leg linked to GND (0 Volts DC or AC..)
(exception for decoupling bi-polar supply caps where you can link both to GND or replace them with a single cap between + & - (Vcc & Vee).

Not ALL capacitors. Series capacitors are excepted obviously.

(one leg grounded capacitor can't considered "series" anymore, can it Gord..??)

[GGBB]

(one leg grounded capacitor can't considered "series" anymore, can it Gord..??)
[/quote]

No it can't, just like it can't be considered "ALL"