2 layers
EEG ESP
ashvin-verma/BigBrainFinal
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AudioToTTL
hansliss/AudioToTTLAudio to TTL adapter stage from my MIDI converter
- Size
- 23.6 × 18.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 11
- Pads
- 31
- Tracks, vias
- 87, 5
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 15 Jul 2018
- Updated
- 15 Jul 2018
Overview
AudioToTTL is an open-source printed circuit board by hansliss, from the hansliss/AudioToTTL repository on GitHub. It is a 2-layer board of 23.6 × 18.7 mm with 12 parts on 11 nets, routed with 87 tracks and 5 vias.
It is built around the CA3130E. Its parts include 4 resistors, 3 capacitors, 2 diodes, 2 connectors and 1 IC. It belongs with the audio and music boards of this library.
Main components
1README
README.mdAudioToTTL
Audio to TTL adapter stage from my MIDI converter.
This was taken from a schematic for an analogue frequency counter, design 27 in the Elektor book "501 elektroniska byggprojekt" (ISBN 91-86898-00-0) from 1995, a translation from a Dutch book from 1984.
I used this with great success in a 1999 project to convert square wave audio to MIDI using an Atmel AT90S1200, and it turned out to be able to extract information from mixed audio as well. It can probably be used with an Arduino to build frequency counters and similar projects.
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 2k2 | Resistors_SMD:R_0603 | R3, R4 |
| 2 | DUS | Diodes_SMD:D_MiniMELF | D1, D2 |
| 1 | 10M | Resistors_SMD:R_0603 | R2 |
| 1 | 22n | Capacitors_SMD:C_0603 | C2 |
| 1 | 22nF | Capacitors_SMD:C_0603 | C1 |
| 1 | 3p3 | Capacitors_SMD:C_0603 | C3 |
| 1 | 560k | Resistors_SMD:R_0603 | R1 |
| 1 | Audio_in | Pin_Headers:Pin_Header_Angled_1x02_Pitch2.54mm | J1 |
| 1 | CA3130 | Housings_SOIC:SO-8_5.3x6.2mm_Pitch1.27mm | U1 |
| 1 | TTL_out | Pin_Headers:Pin_Header_Angled_1x03_Pitch2.54mm | J2 |
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Questions
How big is the AudioToTTL PCB?
It measures 23.6 × 18.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the AudioToTTL use?
12 parts, built around the CA3130E. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the AudioToTTL KiCad files?
From the hansliss/AudioToTTL repository on GitHub, at the commit this page was made from: the board is AudioToTTL.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the AudioToTTL design in my own project?
Its repository states no licence, so its author keeps all rights: ask hansliss before reusing the design.