163.99 EUR
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 Fully automatic SCART switch with full galvanic inputs separation.


  • 8 scart inputs ( full rgb, s-video, composite, blank, TV mode)
  • 1 scart ouput
  • "Knight rider" style active scart detection
  • clean sync on output
  • full ROHS
  • AVR controller with firmware future updates
  • HQ plexi transparent ( made by me ;-) at my laser machine)
  • MICRO USB power supply (regular mobile phone charger 5V will do the job - please, use sth decent - approx 1A)


If You need more inputs, please consider daughter board, that will add another 8 scart  inputs  - Hydra HEADS



 How doees it work ?


       Imagine, You have many retro system in use. Amiga, Atari ST, ZX spectrum, etc... And You have only one classical TV/Monitor with one SCART INPUT.  Each time, You want to switch system, You have to connect Your machine to Your monitor. Everytime, You do it - You damage scart socket inside. Those days are over. Connect up to 8 computers/consoles to HYDRA, then connect HYDRA to Your TV/Monitor and power on hydra with You mobile phone charger with MICRO USB plug. Since now, HYDRA will detect active scart input and forward all signals to Your monitor. Simple and efficent.




What happens if i have two active sources the same time ?


Nothing, First applied input is master signal. You can switch to next one pressing buttons ( previous/next) or switching off first computer

There is also third one - HD/SD mode :-) - nice feature of multiplexers used - You must see it to believe in quaility



 FIRMWARE UPDATE PROCEDURE: (thanks to Frank Skilton for debugging)

  • download last firmware from download section
  • connect usbasp (or any avr programmer) to KANDA connector of HYDRA (PINOUT)
  • run Your AVR programming software
  • flash it





Q: I have a PlayStation 1  have hooked up to it and it does not seem to work.I am using a very high performance scart cord from the hydra to the adapter and all of my scart cables are from retro gaming cables in the UK or retro gaming accessories from ebay.

A: Please, mod the cable. for 99% percent You have sync stripper installed. Please, remeber and keep in mind, that HYDRA has already fitted sync stipper and will not lock on scanning on input with clean sync.  Feed composite video (or best luma) to scart pin 20 directly, avoiding elements on the way. Adding a sync stripper is the good option, but right before the display is the best one. Below, CHECK MY MOD of cable and schematic for orginal cable.


Q: Hydra makes "click sounds" when scanning. is that normal ?

A: Yes, all hydras when scanning for ative input behave the same. For short perios of time main cpu connects output with underlighted input. There is no easy way to eliminate this, but adding few ms delay when  active scart is detected and connection input <=> output established. It is subject of next ver HYDRA being designed.


Q: Hydra acts strange. doesn`t detect inputs, sound is disturbed, video blurry...etc

A: Two words: POWER SUPPLY. Please, use decent one.

Q: Hydra gives "jumpy" picture. I have SNES and my cable is pal one.

A:  HYDRA has built in signal termination - 75ohm resistors to gnd. If Your cable has this feature, picture will be darker and may be jumpy. Remove passive elements on RGB lines.  please, read next one answer

Q: Hydra is very problematic with my systems.

A: No. it is not. problematic are Your cables. Please, keep in mind, that hydra has built in many features, like sync stripper, signal termination, low/high pass filters. Please, use regular and simple cables to connect Your systems.  For best effects, please considering direct RGB connection, composite video connection and sound to scart socket. ONLY EXCEPTION is RGB switch - 16pin of scart input. it must be pulled high by resistor from 5V to make hydra switch into RGB MODE.


Q: Hydra has three buttons; what are they for ?

A:  Please, find below:


 BUTTONS: (firmware update may be needed for all units delivered before Apirl 2017)

  • left - scan for active source to the left from active one (if active is far left, no action)
  • right - scan for active source to the right from active one (if active is far right, no action)
  • middle - HD/LOW PASS filter (led on/off) - default ON
  • left+right pressed - disables "knight rider led effect" 


Q: My device doesn`t detect active input on one of the scart inputs. Leds are not as bright as used to be.

A:  Problem.. serious one. You have connected active device to Hydra exactly in the moment when scart input was underlighted. Hydra has esd protection, but high voltage burst will kill all electronics. Please, contact me. 










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