Gristleizer build problems

[dze]

Hi guys,

I've recently gotten myself to a Gristleizer pcb board from a friend and got time to finish building up the board.
I'm using this as my reference for powering up the board with +/- 9v.







and I'm using this as my build for wiring,



Sorry this is a noob question and I've got some questions.

On the bipolar power diagram,

As in the diagram, I use a stereo jack and I connect my input- tip to the board and ring to 6.8k and sleeve to GND where the 2 caps meet. For my output, I connect the tip to board ground to GND on the bipolar power.
Basically I connect both the ground on the input and output together. When I unplug it from gnd at least I get a sound coming out, but really really soft. When I plug it in, everything falls silent.

I'm using a TC1044 on the bipolar power supply.

Where should I test the if there's power coming into the board? And how should I test this?
thanks for your patience!

[BluffChill]

Your diagram doesn't seem to show whereabouts the input goes but I've built dozens of Gristleizers so i think I know what's going on. However, why is the ring of your input jack going to a 6.8k?

[antonis]

However, why is the ring of your input jack going to a 6.8k?

Probably for switching p-n-n ON when input pluged..
(base resistor to GND via sleeve...)

[dze]

I've been searching around for more infos regarding building up the gristleizer and these are the best  I could find.
Is this also the diagram you use?

Hmm I'll try to explain the best I can.
I've breadboard the bipolar power yesterday, and it doesn't even turn on, no sounds or pops when I flip the switch nor turn the knobs. The board came originally with an attach 7809 regulators and 3 cables for +9v, -9v and 0v. The previous owner used it on in his modular system. I tried to power it up with the regulators attached with this diagram below, and at least I get a pop sound when I flip the switch or turn the volume. But no input audio. So I thought that it might be the problem with the bipolar circuit that I used. Hence i remove the 7809 regulators and use the pre-mentioned diagram instead as it did state that it works well with the gristleizer.



Does the input on the gaussmarkov diagram mean audio input? So it' right using a stereo jack on the input?
Also I noticed at TR2, 2N3819, the source and gate are connected together. This is right?





Also on the board itself, there's an input and output connection. So I connected those to 2 jacks and the ground to the bipolar circuit gnd? Is this right?

[duck_arse]

seeing as those traces on the fet pins are labelled "GND" and "-9V" DO NOT connect them together. and seeing as the circuit dia I can see shows the fet source to ground, it appears that one leg of the fet needs to be bent to fit the layout. odd.

[dze]

hi

dave - I don't get what you mean? Should i connect 2 fet pins together? As it shows in the diagram? hmm
which one is the right one? It's confusing.

Bluffchill - any ideas of what you think might have gone wrong?

[duck_arse]

[my name's not actually dave, or shirley, but] no, don't connect two fet pins together. I think you need to bend one outer leg to reach the pad in the "GND" line.

when in doubt, follow the circuit diagram.

[dze]

opps sorry duck_arse... it was a typo. ok I'll check the circuit again. Thanks

[Ben_buttons]

Hi there!

Any chance anyone could explain why I'm getting a constant high pitched tone coming through my gristleizer circuit? I've installed all the listed parts from musicpcb.com where I bought the pcb from. I haven't seen anyone else complain about this problem so I'm assuming I've done something very stupid. I'm going to go over the circuit again but any suggestions on what would cause a really high pitched noise. It's not an input issue as it occurs when there's nothing connected to input.

Thanks

[BluffChill]

Hi there!

Any chance anyone could explain why I'm getting a constant high pitched tone coming through my gristleizer circuit? I've installed all the listed parts from musicpcb.com where I bought the pcb from. I haven't seen anyone else complain about this problem so I'm assuming I've done something very stupid. I'm going to go over the circuit again but any suggestions on what would cause a really high pitched noise. It's not an input issue as it occurs when there's nothing connected to input.

Thanks

I can practically guarantee this is down to your voltage inverter chip. The 7660s chips I have found to be very fussy - they all have different sub-type numbers, and I've found '15084P' to be the only one that doesn't whistle like crazy, if that helps.