Page History

Here are some important Issues and Fixes from the first batch TTSH pcbs (delivered around March 2014)

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update 01.October 2014 VCO2/VCO3 bleed fix 

(page links/anchors)

1. pcb silkscreen failure for powersupply
2. Hum issue on Speaker and more
   
3. Noise "distorted"
4.   Clock bleed on VCO pitch    
5. wrong Silkscreen for matched pairs
   
6. wrong Silkscreen or polarity for Capaciator C20
7. VCO Bleed - Regulator
8. not all LEDs are working
9.  LED Dimming Fix 
10. VCO2-VCO3 Bleed fix

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Solutions:

= tested

= untested

 FIX for pcb silkscreen failure for powersupply

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Option A: the easiest way is the usage of a BC337-16 with folllowed orientation, there´s no need for addional parts.

Option B (from nordcore)

leave out the 2n5172 - use a bc337-40, - bend right leg to top, solder a 10K resistor in series to the 1uF cap.

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FIX for wrong silkscreen or polarity for capaciator C20 in RINGMOD section valid 

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6fix 6fix

change the polarity of C20 10µF elecrolytics (its the right hand capaciator)

VCO Regulator:

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VCO Bleed - Regulator VCO Bleed - Regulator

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1. build the VCO regulator
2. desolder or cut the MLCC 100N from the power inputs on all 3vcos and from voltage processor, the 10uF caps can leave out too (but its okay to have this)
3. drill a hole in pcb to mount by a 10/12mm spacer the pcb.
4. put a further spacer on the 10/12mm spacer for calibrating the VCO regulator (dont connect the regulator to the vco header yet.
5. connect only power input to regulator and set it to 14,6V (TP1+ TP2, TP1+TP3)
6. unmount the second spacer and place the regulator in MTA header for final calibration/further tesing/building.

Issue: not all LED´s are working 

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LEDs LEDs

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wire a ground to shielded cable shielding