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Status |
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wiring from PSU to the module headers are wrong "silkreen error" +/- must crossed - doublecheck before power up modules,
you find other issues in the second tab here
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http://thehumancomparator.net/4027-2/
Start assembly Main PCB
Use standoffs/Spacers:
Add the Jumper near powersection (left hand of ferrit beads)
Mounting VCO-1 pcb with long headers, but solder before 150K & 3m3
please read at first the known issue page - VCO2/VCO3 issue
( i use long headers instead of zthees preferred headers to have more space between subvco parts and mainpcb, zthees solution is better for troubleshooting, but you have to unmount the frontpanel due to cutting the cabletie)
PSU with DC-DC Voltage "regulator"
right picture shows the X-crossed ferrite bead to fix the -15/+15V silkscreen error,
cross one Ferrite on top pcb side - the ferrite on other pcb site (not shown here)
VCO testing - wiring a +15v cable to resistor and probe ..
further: dont solder the needed jack complete - solder only a bit, because the frontpanel don´t fit with this position 100%
VCF picture - handle with care - 2n3904/06 - BC558 doublecheck the position near Tempco
further please read careful Jons building guide for VCF - there is a issue with matched pair 2N3906 - silkscreen error etc - check here
AR/ADSR
VCA
for testing: test with probe a VCO (need +15V cable see VCO testing above)
feed the VCO signal to the VCA and check the waveform with a oscilloscope.
Ringmod, Preamp, Envelope Follower
Mixer
Don´t solder the pot, switch, jacks - the frontpanel dont match with the Partposition yet.
Noise, Voltage Processor
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with the 2n5172 the noise is distorted and have a very high gain.. |
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Change in the voltage processor section the LM301 for a TL071 and dont assemble the 30pf capacitor. (its only one IC to be changed)
first Panel mounting test
S/H - Clock - Noise
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Due to some issues from the clock LED driver - we bridge the 2n5172. |
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All Parts soldered, Panel mounted, need to solder the jacks.
Building tip:
if you want hear the sound of your TTSH prior you have finished the headphone jack wiring,
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| Tip |
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If your NOISE leds and left Volume led dont work.., connect the 470r resistor near amp/noise to the unlabeled solder hole (ground) its a grounding issue by removing the 10R and cap in power section due to hum issue (described in next step) |
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HUM Issue:by using of both amplifiers for integrated speakers i had massiv hum, by touching the panel the hum sound changes. (hum is only in speakers not in main out) a workarround from zthee, was tested by me - it helps. |
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use RG174 cables or shielded microphone cable for offboard wiring.
for testing ..
Planned Case:
Finalcase..