finishedReleased 11/2013 the buildguide is only for rev.1 - check for TTSH rev.2 this PAGE rev3 herelast Modification Date: 20.June 2017 - Voltage processor TL071 instead of LM301 BOM from me: BOM TTSH modified rev.1 Dokumentation: http://thehumancomparator.net/building/ Schematic: TTSH-schematics.pdf (also avaiable on zthees webserver) PCB reference designators: TTSHcompplc.zip thx to http://tauntek.com/TTSH.htm Muffwiggler Forum infos: (first page) http://www.muffwiggler.com/forum/viewtopic.php?t=98954&postdays=0&postorder=desc&start=2130 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 |
Please read Buildings tips and known Issues site to save time and money.
I have completed few TTSHs and can share my experiences here.
Dont solder switches, Pushbutton, faders and jacks prior finally assembly - the orientation is only correct by placing all jacks/faders together with the Frontpanel because the pcb bends a bit.
Result from Widy/DSL-man:
BOM page own: this modified BOM is for TTSH rev.1 (sale from December 2013) Here is the Original BOM from the great TTSH (Arp2600 clone) Mouser cart https://de.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=4998691276 please add:
some missing parts like Transistors, ICs, Reverb Spring, PSU, connectors, jacks and many more:
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check the pcb for failures ! |
you have to mark the pcb with labels or sticker by using Mods/bugfixes. otherwise you have to desolder parts.
Starts soldering the VCO Boards:
Online building documentation failure:
for VCO pcbs in zthees building website shows 1x61k9 but needed on each pcb 2x 61k9 resistors
http://thehumancomparator.net/4027-2/
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)
cross one Ferrite on top pcb side - the ferrite on other pcb site (not shown here)
further: dont solder the needed jack complete - solder only a bit, because the frontpanel don´t fit with this position 100%
further please read careful Jons building guide for VCF - there is a issue with matched pair 2N3906 - silkscreen error etc - check here
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.
Don´t solder the pot, switch, jacks - the frontpanel dont match with the Partposition yet.
with the 2n5172 the noise is distorted and have a very high gain.. |
tested Rolution:
leave out the 2n5172 - use a bc337/16, - bend right leg to top, solder a 10K resistor in series to the 1uF cap.
Change in the voltage processor section the LM301 for a TL071 and dont assemble the 30pf capacitor. (its only one IC to be changed)
Due to some issues from the clock LED driver - we bridge the 2n5172. |
All Parts soldered, Panel mounted, need to solder the jacks.
if you want hear the sound of your TTSH before you have finished the headphone jack wiring,
you have to switch with a jumper the T/TN or R/RN header, otherwise your Amplifier dont have a audiosignal.
place each row of faders on PCB and solder 2 pins, place the Panel in right way and mount all screws,-- solder the Faders complete. remove the panel and plug all jacks in position, place the panel - mount all screws and few jacks with screws - turn the device, solder the jacks. solder the LED at last. Use on all sides spacers, for a faster panel un/mounting use spacers (with plastic/silicon washers) instead of screws and you can turn the panel on table without breaking some faders. |
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) |
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. |
Solutions:
short out the 10Ω resistor and the 100p capacitor in the PSU section. E.g. just make a small bridge between the pad close to 10Ω and 100p as in the attached picture.
use RG174 cables or shielded microphone cable for offboard wiring.
for testing ..
Finalcase..