pacoarcade
Professional
Initially when I made this post it was called Machinegun Supergun and the design was simpler, but it has evolved into Pacogun.
It pretends to be a simple, safe and cost-effective way to connect JAMMA boards to SCART TVs and audio amplifiers or speakers, with a focus on audio and video quality, reliability and electrical correctness. This means that I'm continuously looking to improve it in this regard, looking for new video amps, audio components, etc. Suggestions are welcomed.
This design is inspired by other projects:
Features
It pretends to be a simple, safe and cost-effective way to connect JAMMA boards to SCART TVs and audio amplifiers or speakers, with a focus on audio and video quality, reliability and electrical correctness. This means that I'm continuously looking to improve it in this regard, looking for new video amps, audio components, etc. Suggestions are welcomed.
This design is inspired by other projects:
- CSYNC buffer from HAS Supergun and AV-Driver
- PSU connector (same pinout) and component ideas from Minigun
- Idea to use an audio isolation transformer from PARSEC
- Connector placement from HAS Supergun
- DC-coupled RGB output for signal integrity using a THS7373 video buffer
- Connector to plug a CSYNC processor circuit in form of "hat"
- Isolation transformer with polypropylene capacitors and a jumper to remove ground loops when using minijack output
- Color calibration pots and, at the same time, brightness control using one knob
- Direct speakers output selectable by an accesible switch and a two pin molex connector
![pacogun2dash-3.jpg](http://www.arcadeencasa.com/pub/pacogun/pacogun2dash-3.jpg)
![pacogun2dash-5.jpg](http://www.arcadeencasa.com/pub/pacogun/pacogun2dash-5.jpg)
Features
- Voltmeter that can be disabled, set to +5V/+12V selectable by a jumper
- Heavy gold plated KEL connector made in Japan
- Buffered and 75Ω impedance matched R,G,B video signals
- TTL or 75Ω ~400mV buffered CSYNC selectable by a jumper
- Individual pots to adjust R,G,B to achieve perfect color balance in any TV set
- +5V and GND footprint between the joystick connectors
- SPK+, GND and SPK- footprint for direct speakers with MVS Stereo or Konami Stereo games
- Switch to select Line Level audio or direct speaker output
- Molex Mini Fit PSU connector with the same pinout than Minigun
- 2x DB15 connectors following Undamned pinout
- Extended JAMMA Buttons 4 & 5 support via switch (thanks to plasia)
- Buttons 4, 5 and 6 through JST Kick harness
- Mini DIN-8 AV connector with the same pinout as Minigun / HAS / XRGB Mini
- Audio atenuation featuring galvanic isolation with high-pass filter using polypropylene capacitors
- 3.5mm Mini jack audio output that disables audio through Mini DIN 8 when used
- AUX connector with DC coupled R,G,B, raw CSYNC, attenuated audio, +5V and GND
- Four CSYNC modes: Schmitt, THS7374, Raw and external trough AUX connector
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