Question about the "Aussie" Compressor

[Royalston]

Hi
As a fellow aussie, I feel patrotically obligated to build this compressor.

http://members.optusnet.com.au/~jethro.dog/mypic168.jpg


Its fairly simple but Im fairly new to this...so I have three easy questions about the schematic

Where is Pin 4 going? Its a line with 2 dots and an arrow. Is this the same as VCC?..ie. the "red + line " in my simpletons language.

And Pins 6 & 7...where do they go?

Thanks for this cool simple idea...

Royalston

[theundeadelvis]

My guess would be that it goes to ground, but I'm not sure why there's 2 dots?

[theundeadelvis]

Sorry, my last post was a bit imcomplete. I believe pin 4 goes to ground judging by the datasheet. Pin 6 goes to the 9v positive. Pin 7, I believe, doesn't go any where. Hope this helps somewhat.

[Connoisseur of Distortion]

it's ground. the layout just added a couple of 'joints' in there.

[Royalston]

so they all go to ground? (Pins 4, 6 & 7)



Im getting a very hot IC when Im running this right now - no sound...just a lot of heat....

[slacker]

Pin 4 goes to ground
Pin 6 goes to 9 volts
Pin 7 shouldn't be attached to anything

I'd have a look at the datasheet to make sure you've got the pin out right.
http://www.alldatasheet.com/datasheet-pdf/pdf/8887/NSC/LM386.html

[Jaicen_solo]

Now maybe it's me, but i'm having trouble working out how exactly how this circuit is supposed to work.
It looks to me like a variable proportion of the input signal is fed back from the output of the 386 to the gate of the MOSFET.
This in turn produces a variable resistance to ground for the input signal. Is that right?? Seems to me that it's quite similar to the UREI 1176 FET comps.

[Royalston]

hey
thanks for the tips...I had it wired up correctly...but still no sound
Just a REALLY hot IC (when battery is plugged) and when testing with a multimeter I get 0 volts at pin 5 which doesnt seem right

hmmm....