Another Dodgy Bad Stone Build...

Started by Scruffie, September 06, 2010, 05:14:33 PM

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Scruffie

Just had a layout made up for the Bad Stone Phaser and a Proto Run of Boards made for it but of course, there's problems...

I haven't actually gotten round to building mine up but the member that has, is getting a slightly dirty signal, odd voltage readings and of course no phasing.

Voltage Readings from a 8.5V Battery, First Obvious problem, only just under 6V getting to the Op-Amps, without them in, Get Correct voltage, as they go in, the voltage drops down...
IC-3 Looks suspect to me aswell, shouldn't it have simmilar readings to the other Dual Op-Amps?

Resistors R3,4,38,39,50 have been checked for value (Co-Inciding with this schematic - http://topopiccione.atspace.com/pjimages/EHBadStone.sch.gif ) Otherwise the voltages look within reason for bias, except the issue of low voltage.

I can't think how to post the layout for this though... it's a 4-Layer Express PCB File, I know that's gunna make it hard but I thought someone might be able to take a guess.

IC1:
pin1 - 1.48
pin2 - 1.47
pin3 - 1.64
pin4 - 0
pin5 - 1.49
pin6 - 1.52
pin7 - 1.46
pin8 - 5.53

IC2:
pin1 - 1.55
pin2 - 1.50
pin3 - 1.64
pin4 - 0
pin5 - 1.62
pin6 - 1.47
pin7 - 1.47
pin8 - 5.52

IC3:
pin1 - 5.51
pin2 - 3.52
pin3 - 1.63
pin4 - 0
pin5 - 1.63
pin6 - 3.43
pin7 - 1.38
pin8 - 5.50

IC4:
pin1 - 1.64
pin2 - 1.51
pin3 - 1.63
pin4 - 0
pin5 - 1.62
pin6 - 1.56
pin7 - 1.48
pin8 - 5.49

IC5:
pin1 - 3.04
pin2 - 1.62
pin3 - 3.04
pin4 - 1.62
pin5 - 3.04
pin6 - 1.62
pin7 - 3.04
pin8 - 1.62
pin9 - 3.04
pin10 - 1.62
pin11 - 3.04
pin12 - 1.62
pin13 - 0
pin14 - 3.04
pin15 - 1.62
pin16 - 3.04

IC6:
pin1 - 0.64
pin2 - 1.62
pin3 - 1.61
pin4 - 5.42
pin5 - 1.75
pin6 - 1.57
pin7 - 1.62
pin8 - 1.60
pin9 - 1.62
pin10 - 1.62
pin11 - 0
pin12 - 2.41
pin13 - 1.53
pin14 - 4.14

Scruffie

Fixed and Running, Blown IC like it looked like.