crisistech

Crisistech Brand Name Was Born On May 2007 Before Greek Crisis, The Domain Name & The Site Was Created On 2011-07-22.

Our Philosophy 10 Letters 10 Words…Crisistech

C-reation
R-ecommendation
I-nspiration
S-amplification
I-nnovation
S-ofistication

T-echnological
E-volution
C-oordination
H-elp

There Was Our First Try To Share – Insert Technology, Innovation, Inspiration & Sharing Ideas Into The Real Word.

 

 

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Power Supply & Automation Board For Ceramic Power Tetrodes

This article describes a modern stabilized screen-grid power supply
with MCU that provides adjustable voltage and a good regulation.
It also includes very effective circuits to protect the tube and
the rest of the amplifier.
With some changes to meet specific requirements for screen – grid voltage and current,
they can be used as an upgrade for almost any existing tetrode Power Amplifier.

This project protect the tube and amplifier against faults.
It has been tested in sevarals power amplifiers including
ceramic tetroders 4X150 & 4CX250 4CX1500 mid power amplifiers.

Variable Screen power supply Mosfet based with a standard range
between 200 to 500Vdc & current at least 80-200Ma
which can be limited from 30-200mA VDR Protection included.
Variable Grid power supply with a standard range
from 1.5-140Vdc & current over 200mA VDR Protection included.
Filaments Auto range selector between 6V & 26.5V with current sensor.
SWR Protection for Reflective Power Protection.
Over voltage or zero voltage Protection for both Screen & Grid, (High Voltage Cut Off Mode)
Buzzer for acoustic multiple warnings different for each failure.
Optical fault indicators.
Reset Button.
Service Mode Function for repair, calibration & final test.
Fully isolated MCU Circuit from any other tube voltage.
Low Profile Modular PCB with dimensions 249 x 80 x 35mm or 9.80 x 3.15 x 1.38inch
HVPSUSMALL
Protype PCB Automation
DSC03173
The Automation Inside A Medium Power 50-150Mhz 4X150/4CX250/4CX350/8930 Based VHF Amplifier

This project is for sale, available for manufactures only.

Schematics, Gerbers And BOM List Are Available

This project is for sale, available for manufactures only.
Regards
AkisT – George Kentar

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A Rack Mount 19” Power Supply Unit 0-30V 0-10A 300W
A non common but usefull tool for every laboratory is an adjustable power supply, high quality & stability were approved.
When i decided to design this device i was very lucky, a friend of mine came with a damaged one & he ask me to fix it, i took the risk to re engineer it
but as i wrote several times before i’m going to be a whole-hog nerd when i’m going to sign a device, my first thought is always safety & a good MTBF.
A RACK MOUNT 19” 300W PSU 0-30V/0-10A designed (case, pcbs, & panels) for laboratory use, but with a high difficulty constructive level.
Designed for hard working conditions, with over temperature, current & power failure protections.
Specifications
Voltage Supply: 110V-220V 50-60Hz (depend on country region)
Output Voltage: 0-30V DC With step less than 0.1V (full range scale)
Output Current: 0-10A DC
Protection
– Current limitation
– Over temperature protection at 70C
– Short Circuit Protection
– Soft Start Input protection circuit.
Indicators
– Over Temperature with LED
– Fuse failure Indicator with LED
– Over current limitation with LED

Power Consuption 300W max
Ripple Max: 0.2mVrms
THIS PROJECT IS NOT FOR SALE.
Regards
AkisT

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A Rack Mount 19” Power Supply Unit 0-50V 0-10A 500WFor several times in the past i push myself to work with a medium power lab psu with voltage & current range over 50V & 10Amps.
I must be honest with my self it was a boring proccess…let me to explain what i mean,
sometimes i fell like a whole-hog nerd & when i’m trying to design or to improve an old design this can transform me to a workalcoholic strange guy.
Yes, i spend over a month into my lab to design a solid state device with excellent performance & stability.
A RACK MOUNT 19” 500W PSU 0-50V/0-10A designed (case, pcbs, & panels) for laboratory use, but with a high difficulty constructive level.
Designed for hard working conditions, with over temperature, current & power failure protections.
Specifications
Voltage Supply: 110V-220V 50-60Hz (depend on country region)
Output Voltage: 0-50V DC With step less than 0.1V (full range scale)
Output Current: 0-10A DC
Protection
– Current limitation
– Over temperature protection at 70C
– Short Circuit Protection
– Soft Start Input protection circuit.
Indicators
– Over Temperature with LED
– Fuse failure Indicator with LED
– Over current limitation with LED

Power Consuption 500W max
Ripple Max: 1mVrms

Schematics, Gerbers And BOM List Are Available

This project is for sale, available for manufactures only.

For technical – hardware and purchase inquiries contact at : akis@crisistech.com

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Infared TesterRemote Control Tester
Sometimes you need to check a remote control but you have no time or instruments to check it.
The most common failures are damaged buttons or a dead crystal oscillator.
These remote devices are very sensitive, f.e. common human habits such as drinks and food are not healthy for buttons or
an accidental short flight on the floor is not a good idea either..lol.
There are several ways to test a remote control but if you need a cheap & easy probe i have a solution for you.
BPW41N is a high speed and high sensitive PIN photodiode in a flat side view plastic package.
The epoxy package itself is an IR filter, spectrally matched to GaAs or GaAs on GaAlAs IR emitters
(Lp = 950 nm).
The large active area combined with a flat case gives a high sensitivity at a wide viewing angle.
In this project we need the top of the photodiode as the sensor area so you must leave it uncovered.
At this point we can work with the output signal of this photodiode which is quite enough to see
with an oscilloscope if your remote control works!!!
You can find the specifications for BPW41N at http://www.vishay.com/docs/81522/bpw41n.pdf
You need only 3 elements to make the remote tester & an oscilloscope to have a function view.
1. A good quality Male Metallic Rca
2. A Bnc Male to RCA Female adapter.
3. A BPW41N Photodiode.
Also you must use
A soldering gun less than 40W,
Soldering wire about 0.5” or 12mm,
A small cutter,
A small piece of cable (the cover) to use it as an isolator for the cathode of the photodiode.
You can solder the cathode to the main pin of the RCA & the anode on the ground body (coaxial), look at the picture.
Use the isolator included in the rca to isolate all the photodiode from the main ground,
plug the RCA to the BNC Adapter & put it to the oscilloscope input.
Turn on the Oscilloscope & place a good working remote control at 1-3 inches from the uncovered photodiode top.
Press any button and if your oscilloscope is a modern one use the auto range for the vertical & horizontal functions
at this point you can see a small signal for a few seconds when you press the button, this probably means that
your remote control works at least the button you pressed before, follow the procedure with other buttons.
Next step is to check a faulty remote control.
I wish you happy constructions.
Thank you.

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