Jo Tech Service


 INDEX




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Active strong pass audio filter, with adjustable setting of minimum pass level.
S
uitable in background noise reduction systems..


Analogue , high speed, adjustable,  weak audio signals reduction filter .

Still in test phase  with  
prototypes
Video examples are all made in our workshop. 

Read more   /   some video examples :

Real time voice audio background  noise and hiss cleaner ,


Live /  real time  audio voice sound background / ambient noise & hiss reduction / removal  /  cleaner /  filter  /  limiter , 
Unlike a noise gate this system will reduse background noise all the time , also inside a message .

Measured  
hiss noise reduction : up to  100 x  or   20db
 
Strong pass audio filter test  :

Demo video , youtube



Active strong-pass voice audio filter,
with adjustable setting of minimum pass level.

Live  audio hiss and background noise reduction ..

What you will hear :
The background noise has almost vanished
The  sound is close to the original.
No time delay or change in pitch and tone balance


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Industrial Analog Multiplexer
Detailled schematic examples
0 - 10V  /  4 - 20mA




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Programs written by Joar Falstad, jotech.no


Advanced Public Address System




PC controlled. 
Detailled schematic examples.
ISA demo version download
First ver : ISA  Win95.  
Latest ver :  usb Win7

Advantec USB 48ch DIO interface
and a digital input / output board, also from Advantech

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AD/DA Conversion and Data Acquisition made easy.



Time and Masterfile controlled AD-DA conversion ,
Easy setup. Easy to run and control.
The Masterfile
is generated by the program itself , as a linear "Unit Value" function from a Time ref to the next "Unit Value" at the next Time ref.
There is no limit in number of Time ref's  from tne project start time to the final stop time.
PC clock is used to control the Time

First ver : ISA , Win95 .  Early demo version download
Next ver : PCI , Win98 . Plug & Play.
We are now working on a USB ver in Win7




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Abouth


Special / ideas / programming / news

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DMX  stage lights control    . 
How to connect  & more 


Link to:  
Enttec  compatible  DMX    open source VB6  program download .  1ch. to 512 ch.
PC  : Win 7 + VB6

Link to:   Universal DMX program
download1ch. to 512 ch.
PC  : Win 7
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Service
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Sony update / service
TA-5650 , drifting bias fix.

Vingtor, Stentofon
Old / obsolete intercom systems.  Replacements. Repairs

Compact 32-2  /  VMP32-2
Old / obsolete intercom systems.  Replacements. Repairs

Zenitel, AlphaCom,  ACM 
Later systems.   Manufactured today .  Also compatible with older wireing and stations.

Monacor Catalog  
We are one of many Monacor suppliers in Norway.


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Domain:       Jotech.no     ( registered on 20-03-2001
)

contact:       Joar Falstad

phone:          +47  99718408

Mail:            mail@jotech.no

url:                http://www.jotech.no



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A big  company has now taken the  same domain name  . " jotech "
To protect our site  and  keep it seen on the internet , we'll  continue to add nice pictures , mostly from Norway.



 Norway , Trondheim


Morning view .
Norway, Lyngen alps  , Havnnes , Rotsund , Nordreisa



Norway, Ekne Falstadberget
Nostalgy from the 70's.  With Vital 15 feet




South Africa .  Cape Town


South Africa .  Cape Town

South Africa .  Cape Town

South Africa .  Cape Town

South Africa .  Cape Town

Norway , Malvik, the ghost tree