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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
Please read Buildings tips and known Issues site to save time and money.
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optional parts from VCO bleed fix (caps)
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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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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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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)
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. |
All Parts soldered, Panel mounted, need to solder the jacks.
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you have to switch with a jumper the T/TN or R/RN header, otherwise your Amplifier dont have a audiosignal.
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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. |
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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..