Turing Machine Problem Clock LED and Big Knob

[sebastianjmartin]

hi

my recently assembled Turing machine behaves not as expected. The Scale Knob, Length Knob and Wirte switch seem to work fine and the module also responds to the clock but the LED does not pick up the clocks frequency and stays always on instead. The output sequence is also not random and but holds a pitch defined by the scale knob. Also the big knob seems to have no effect on the output at all. There are no glitches at all during calibration process, no matter what the position of the calibration screw is.

mattzog described a similar kind of behavior here: https://github.com/TomWhitwell/TuringMachine/issues/42

but my ICs seem to be in the right place and the legs are not bent or anything.

would appreciate to get some suggestions to fix that :)

Thanks !

[TomWhitwell]

Hi, sorry to hear that this sounds a lot like a little build problem, should be easy to fix. Some things to check:

• Missed solder joints
• Bad solder joints (touch with iron to reflow them)
• reversed chips or transistor When you say 'responds to clock' how do you know if the LED doesn't blink? The TL074 on the front (pot) board handles the clock input, the noise output and DAC output, so a problem there will be pretty fatal.