JonDent - Explorations in Electronics, Electronic Music, Coffee, Sci Fi, Art & Travel (but mostly electronic music)
Showing posts with label DIY. Show all posts
Showing posts with label DIY. Show all posts
Sunday, 26 October 2025
Monday, 22 September 2025
Plinky Synth 4U DIY Expander - build notes
These are my build notes for the Plinky Synth expander.
The Plinky synth is an 8 voice, polyphonic touch synth.
I'm building the expander for a friend.
Links
This is the 4HP expander (not the 2HP version).
The LEDs are pre soldered.
as are most of the components.
I soldered in the Jacks 1st.
There are 2 green ones for the MIDI ... they go above the USB connector (at the top of the PCB).
This 8 pin header connects the two boards.
solder it next
there is a 10pin header... euro power?
Not sure if this is needed if you are powering from the Plinky.
i soldered it in anyway.
The 16 pin header connects to the plinky
Some final pics.
A really easy build!
Wednesday, 10 September 2025
TSNM buchla format - build notes - part 2
This PCB dates from 2017 ..It's a Mark 1
There are modern ones using Teensy 4.0 ..... Mk II
which you can still buy.
This is part two on my build notes.
Part 1 is here:
Links
This Mk I uses the old Teensy 3.2.
....
C16 & C21 - are these part of the +5v section of the PCB?
I've soldered c16 in anyway.
C6 --- DNP ??? do not place?
1N5819HW 2 D1, D2 DO-41 schottky rectifiers 511-1N5819
L2 = ferric bead.
These are connected in parallel ... across either side of the PCB.
Thus I used one ferric beath .. the through hole one. (L1)
Caps : 47uF x 2
-------------
C17 - 100n (SMD ceramic)?? I think this is not right.
looks like an electro maybe 33uF ??
Is it C21 in the BOM??
-----------------------------------
MPR121 board & headers
It's a Adafruit 12-Key Capacitive Touch Sensor Breakout. This connects to the touch plates of the front panel
Cut the trace on the bottom of Teensy next to VIN pin to separate VIN from VUSB. This prevents
powering the Teensy simultaneously from USB and the eurorack power supply.
Teensy 3.2
The two pots - 10K B ... linear (B103)
Encoder
position the two displays and LEDs
The lower header is tricky.
I had to do some gentle bending of the ends.
you need to keep enough room for the two matrix displays... the legs aren't long
Bend these headers so you can solder them directly to the front panel
This is a side on view
to be continued.....
Monday, 9 June 2025
DOBOZ - Touch Sensing Note Memory - Buchla format 4U --- part 1
These are my build notes for the DOBOZ TSNM module
I like the compact format.
Its a sequencer +
Here are some pics of the raw PCBs
One uses a teensy 3.2, and a second uses a teensy 4.0
i bought this board many years ago when teensy's 3.2 were plentiful.
I recently received a NOS 3.2, so thought I'd finish this build.
Links
+ BOM
SEMICONDUCTORS first
Orientation of IC1-IC5 and IC7, Q1, D1 and D2 is clearly designated on the PCB.
74HC595 2 IC3, IC4 - shift registers
mouser 595-SN74HC595DR
OPA171
IC5
SOIC-8 operational amplifier
mouser 595-OPA171AIDR
TL072
IC1
SOIC-8 dual operational amplifier
mouser 595-TL072CDR
ADP150-3.3V
IC7 TSOT-5 linear voltage regulator
Mouser 584-ADP150AUJZ-3.3R7
"The trickiest part may be the DAC8560 (IC2), it’s a VSSOP-8 device.
This is hand soldered
Use lots of flux , a fine soldering tip and fine solder.
... and a steady hand
--------------
MMBT3904
Q1 SOT-23 NPN bipolar transistor
Mouser ;512-MMBT3904
I didn't have this exact transistor.
I used this instead:
Encoder: ordered and arrived.
Resistors..
Some of the resistors need to have 0.1% tolerance
2 x 100K, (R1 & R15)
1K x 1,
27k,
33k,
teensy 3.2
mouser
coco.
Saturday, 17 May 2025
Basilisk - wirehead - build notes - part 2
Part 2 of my Wirehead Basilisk build.
This is a bass line synth from Western Australia.
part 1 on my build is here:
I saw a cool video by Mylar the other day on this synth.
back to the build.
I like to align the faceplate with the pcb using the spacers provided.
Audio sockets and power socket next.
This is the rear of the display
align it with the front panel ... I'm keeping the plastic cover n it for now. ... it sits on top of the face plate.
switch & some pots ... just to check the panel alignment
insert the adruino
final 4 pots
don't insert any IC till after you have tested for shorts ... see the build manual.
Once this is all done plug it in . The synth runs on either USB power or DC 9V
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