The first limited edition batch of CVX4 is currently sold out. I will produce another batch, early 2018.
Have a look at my other MIDI/sound products as well, for combined shipping.
Parallel port soundcard with high quality tuning options, compatible with Covox Speech Thing
Line out connection, intended to connect to amplified speakers
No compromises, we wanted to make the best possible covox clone, and did not spare effort or expenses :
after building 3 prototype generations (CVX1, CVX2, CVX3), this is now the final version :
CVX4 uses very high precision 0.1% all same value resistors, and a reverse engineered schematic (based on a real original covox) for excellent 8 bit sound. Other DIY clones use 1% or 5% resistors, different schematic, ...you can compare... CVX4 sounds way better...
Added low pass tuning options to simulate speaker effect to your own taste.
Dip switch legend for the production boards :
dips 1-5 : low pass filter
1: 1nF : significant low pass filter
2: 4.7nF : heavier low pass filter
3: 10 nF : very heavy low pass filter
4 : 0.1nF : very subtle low pass filter
5 : 0.47nF : subtle low pass filter
dip 6-7 : extra volume divider :
6 : 56k (1/2R)
7 : 27k (1/4R)
8 : bypass coupling capacitor
Dip settings for accurate Covox' sound : dip 7 on, other dips off.
Review and detailed development history by Scali here : https://scalibq.wordpress.com/2017/11/28/the-covox-years/
CVX4 soundcloud demos here : https://soundcloud.com/user-919839499/sets/cvx4-mod-playback-with
CVX4 playing a song using CVXPlay in DOS :
Fasttracker II through CVX4
CVX4 in games : Electro Man
Review/Demo by Phil's computerlab:
Featured in this 8 bit guy demo :