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Impact pal

tpcarlson·synth-diy·drumfiend/impact-pal.kicad_pcb

Impact pal PCB layout, top view — open source NXP board by tpcarlson
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About the Impact pal PCB

Impact pal is an open source NXP PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 40.3 × 128.5 mm, with 175 components from 18 distinct parts.

Its main chip is the Teensy3.2, from the NXP family. Other key parts include the L78L05_TO92. By type, the board carries 79 resistors, 40 diodes, 31 connectors, 19 transistors, 4 capacitors and 2 ICs.

It belongs with the audio designs in this gallery.

From the project

Mostly Eurorack projects

A 19-channel trigger-to-MIDI processor. Send it triggers, and it'll send out MIDI notes.

As measured by the Joranalogue Test 3, around 40 mA on +12v. The 5v and -12v rails are unused. As LED start to light up, power use goes up a little bit - in the very worst case with all 20 LEDs lit, probably around 50mA.

This one's all me! The basic MIDI-out (ie. two resistors) was taken from the excellent Teensy MIDI documentation.

Impact pal, from the project README
From the project README

Main components on the Impact pal

L78L05_TO92Teensy3.2

Impact pal bill of materials (BOM)

175 components, 18 distinct parts.

QtyPartRefs
1
L78L05_TO92
U1
1
Teensy3.2
U2
19
MMBT3904
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +11
19
AudioJack2
J1, J2, J3, J4, J5, J6, J7, J8 +11
1
AudioJack3
J20
2
Conn_01x03_Male
J21, J22
1
Conn_02x05_Odd_Even
J23
4
Conn_01x10_Male
J24, J25, J26, J27
4
Conn_01x04_Male
J28, J29, J30, J31
19
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +11
20
LED
D20, D21, D22, D23, D24, D25, D26, D27 +12
1
D_Schottky
D40
2
100n
C1, C4
2
10u
C2, C5
19
100k
R1, R2, R3, R4, R5, R6, R19, R20 +11
38
10k
R7, R8, R9, R10, R11, R12, R13, R14 +30
20
4.7k
R58, R59, R60, R61, R62, R63, R64, R65 +12
2
47R
R78, R79

Impact pal design files

The KiCad project lives in the tpcarlson/synth-diy repository on GitHub; these links point at the commit this page was built from.

Impact pal: common questions

What microcontroller does the Impact pal use?

The Impact pal is built around the Teensy3.2, from the NXP family.

How big is the Impact pal PCB?

The Impact pal measures 40.3 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Impact pal?

175 components, from 18 distinct parts. The full bill of materials is listed on this page.

Where can I download the Impact pal design files?

From the tpcarlson/synth-diy repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Impact pal design in my own project?

The repository has no license, so all rights stay with tpcarlson. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Impact pal without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.

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