Known Issues and Building tipps for yocto 808 Clone Batch2 - January 2014 pcb version
Failure in Cymbal Build Instruction before 11.02.2014
(copy von e-licktronic forum)
A customers found a mistake on the schematic.
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(the building instruction was updated to correct value on 10.2/11.2.2014)
R44 from 100k to 50k otherwise a 100k Trimmer to change the„tuning range“ for TM1 
validation July2014
Chassis
unscrew the nuts from all pots/encoder or the board bends.
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here is the modificated EPS file.
Yocto_v1.0_Acrylic_Case_ohne_powercon.eps
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Custom LOGO:
added a "Rhythm Composer YOCTO at the Frontpanel
and removed the powersupply square cutting at the rearpanel (see custom rearpanel info above)
Yocto_v1.0_Acrylic_Case_ohne_powercon.eps
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Noise section:
Measurement AC !!
Adjust the TM4 trimmer for for 130mV on pin 1 of 4558.
its important to use a good DMM (multimeter), most cheap DMM have in AC voltage measurement with 3digits high failure rates and cant display 160mV - shows only 0,01.
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i have at least 250mV so changing R127 to 47K ...
for Handclap section:
http://www.e-licktronic.com/forum/viewtopic.php?f=16&t=146&p=525#p525
hear the issue:
http://m.soundcloud.com/patrickj-ricke/yocto-handclap-issue
808 issue handclap:
http://www.muffwiggler.com/forum/viewtopic.php?t=96102&start=10&sid=d6f73a9fdac17e18f1fde05211f88b3d
copy:
This was a little tricky to figure out:
clap reverb mod -
replace r376 (47k) with 100k pot trimpot
This will vary the reverb between full and completely off.
C144 must have the correct polarity.. neg to gnd
you have to trim TM3 to get a handclap sound of your choice
Cowbell
Range: replace R44 und R45 with (xxx kOhm) and (xxkOhm).make sure that your noise is trimmed between 100mV and 140mV AC (RMS)
please read the TR-808 Servicemanual, you find there addional infos about Gain (you can change 2 resistors to minimize the gain of the handclap section)
if your Handclap reverb dont work: measure with a scope the triggeroutput (Tranny Q29), you find it too on the R360 and the q69 ( you must have this on both ! )
Cowbell
Range: replace R44 to a 50k trimmer
adjiust the trimmer on left hand - after a bleedthru you must trim one trimmer a bit more to get a cowbell.
you can doublecheck them by using a scope
http://www.e-licktronic.com/forum/viewtopic.php?f=16&t=189&start=20
Low Noise Ratio (SNR) for Mastersection
http://www.e-licktronic.com/en/content/39-master
change in the Mastersection all carbonfilm resistors to Metallfilm resistors and change all cheap electrolyt caps to LOW ESR caps..
change the ceramic cap (220p) to a c0g capaciator
Low Noise Ratio (SNR) for Mastersection
http://www.e-licktronic.com/en/content/39-master
change in the Mastersection all carbonfilm resistors to Metallfilm resistors and change all cheap electrolyt caps to LOW ESR caps..
change the ceramic cap (220p) to a c0g capaciator
Noise Reducing SNR/NOISE RATIO generell
in many Voices/sections you can find at the output amps a resistor, to reduce the noise ratio you can change this all resistor to a metallfilm resistor and the electrolyt caps to a better low ESR Capmetallfilm resistors.
Bassdrum: R175 1K, R173 6K8, R174 100K,C50 1uF/50V
Snares: R207 1K , R210 470K, C68 33uF/35V
Rimshot: R295 1K, R327 470K, R330 470K, C126 33uF/35V
Low Tom/Low Conga: R235 470K, R238 1k, C82 33uF/35V
Mid Tom/Mid Conga: R266 470K, C95 33uF/35V, R239 1K
Hi Tom, Hi Conga: R291 470K, R294 1K, C109 33uF/35V
Hihat: R161 470K, R172 1K, C83 33/6,3V, R159 470K, R169 1K, C81 33uF/35V,
Master: all resistors, all Electrolyt caps ( 2x 2,2uF/50V, 3x1uF/50V, 33uF/353V)
Cowbell: R163 1K
Accent: all resistors to metall, C25 + C34 to Low ESR (2x 47uF/35V)
Cymbal: R166 1k, R128 470K, C78 33uF/35V
Handclap: R296 1K, R375 470K, C145 33uF/35V
Powersupply : all to metallfilm and all to low ESR caps ( 100R metall x 25 and 47uF/16V x25, 3x 100uF/35V)
powersupply main: C5,C7 2x 2200uF/35, C11 220uF/35, C12,C13- 100uF/35
= 4x 1uF35V
, 9x 33uF/35V,
2x 2,2uF/50V,
27x 47uF/35V,
3x 100uF/35V,
2x 2200uF/35V,
1x 220UF/35
, 2x 100uF/35V
Shopping basket @ reichelt.de
change the 100uf cap to 35V or more in reichelt basket
http://www.reichelt.de/?ACTION=20;AWKID=866139;PROVID=2084
metallfilm resistors don´t included there due to full homestock..