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Patrick Joericke

Patrick Joericke

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IDIssueFixdate

fixed version

1CPU mounting

As you can see you also need to do a jumper wire between the solder point marked A on the pixie cpu and pin 10 (!WE pin) of *any* of IC 7,8,9 or 10 (they’re all connected to the same signal)
Please note:
* This is on the back of the 808
* you solder the pins on the cpu on the “wrong“ side
* the jumper wire can be soldered directly as it’s just one wire, I use a pin header and patch cable here mainly during development as I can easily remove the cpu without having to desolder anything
* as the cpu is upside down, make sure you connect the midi wires the correct way!
* as always - pin 1 and 42 is unused and can be left unconnected (pin 1 is the hole with a square pad)

01/2022
2PSU 

Do not fit the DC jack on the PSU circuit board. Its not used and it is not wired correctly.

use a cable for the jack as shown for example

01/2022
3Tactiles /caps install

heres a tip about the installation of the tactile caps:


01/2022
4MIDI WIRING

  credits to a FB User..

11/2022
5Silkscreen wrong 

11/2022
6Mainboard resistors

11/2022
7guide /tip

for the voice board: 

first install all 1/8watt resistors on bottom of the pcb R1-9 are 1/8w or the switchboard do not fit

use MLCC caps there and no IC socket. for IC1.

when you have a solder frame: install the flat Trannys and ic sockets before you install the other parts


for mainboard

use for the noise transistor and muting trannys - ic socket pins to swap/change the trannys

install good trimmers from nearside instead cheap trimmers from component side - better calibration possible

11/2022
8Transistors - sequencer failure

use sockets for the muting transistors.

some users reported issues in combination with the pixie CPU, boot/start problems.

the muting Transistors affect this  - you can remove this.

1.Dec.2022
9Power Pinout

credits by Martin.J.K  - Thank you

02.Jan.2023
10general

install good trimmers on back side (solder side) - for easier calibration

install the BA662 clone on solder side - in this was you can use a socket

install the muting JFETS and noise Transitor on solder side for easier swapping

install R333 on solder side to give you the opportunity to replace this with a trimmer (50k) to change the handclap sound..

02.Jan.2023
11bugfix

install a jumper as shown to get your 808 working as designed

03. Jan.203
12capacitor on Sync jack

install a 10nF polyester cap or bipolar electrolyte cap at the sync jack or on the pcb



13clock calibration fixremove C203 on mainboard (39nF) or your clock can't be calibrated


Change History
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