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
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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.
