Superb presentation! Thank you. I built a simple "home brew" power supply to light up gas spectrum tubes (hydrogen, helium and neon) for physics homework using a 7kV neon sign transformer and a "dead man's" switch; the tubes only cost around $30 each but the commercial power supply is a $400+ rip-off! It worked really well and cost
Using just 1 resistor from the hv to the voltage meter is bad practice. You should use a number in series. Also conside a diode across the amp meter. Interesting project. I was looking for something like this to test tubes and vacume capacitors for breakdown voltage. What voltage range has your unit? 3 to 20kv would be ideal for me. Thanks.
I wouldn't call it bad practice at all. While it's common in homebrewing to use multiple resistors, this is primarily to bypass the need for proper HV resistors. Commercial products use a single, appropriately rated, resistor, even at 100+ kV. The diode is a good idea though! And yes, it can cover your desired range no problem.
I've been working in electronics for awhile now. Never came across a "spark gap" tester/system. What is is used for specifically? Is this to ensure you know what the maximum/minimum spacings for high voltage/current contacts/embedded features? I work in FA, so I don't get the chance to play around with electronics like in my previous position lol. Thanks for the video
Spark-gap transmitter.. An extremely old type of circuit to generate radio frequency emissions. Transmitters like that were used on the Titanic, or generally in that time period to send Morse code signals around the world.
It's not really pulsed DC, but not entirely free of AC superimposed on top of DC either. There seems to be a 40 kHz distorted sine wave riding on top of the continuous DC output. Sorry for the late response, actually had to put a scope on the output :)
So we're you able to control only voltage with this without changing the current? I'd like to use this for an ion experiment in a vacuum, but my fear is that once the gas ignites the voltage will drop drastically to maintain the current setting when voltage is what I care about more than current.
Great video. I'm interested in replicating your power supply for use in an electrospinning device that requires between 10 - 30 kV. However, most commercial power supplies (such as the SKE EF020) limit current to around < 1 mA. Is it possible to reduce the current in your design whilst maintaining high voltage?
You can limit the current to 1 mA by adding a current limiting resistor in series. Just make sure its appropriately rated for the voltage and the dissipated power.
Superb presentation! Thank you. I built a simple "home brew" power supply to light up gas spectrum tubes (hydrogen, helium and neon) for physics homework using a 7kV neon sign transformer and a "dead man's" switch; the tubes only cost around $30 each but the commercial power supply is a $400+ rip-off! It worked really well and cost
Glad you liked it! There's even higher voltage laser supplies out there. And it seems they're dirt cheap, yet quite reliable.
Using just 1 resistor from the hv to the voltage meter is bad practice. You should use a number in series. Also conside a diode across the amp meter. Interesting project. I was looking for something like this to test tubes and vacume capacitors for breakdown voltage. What voltage range has your unit? 3 to 20kv would be ideal for me.
Thanks.
I wouldn't call it bad practice at all. While it's common in homebrewing to use multiple resistors, this is primarily to bypass the need for proper HV resistors. Commercial products use a single, appropriately rated, resistor, even at 100+ kV. The diode is a good idea though! And yes, it can cover your desired range no problem.
I've been working in electronics for awhile now. Never came across a "spark gap" tester/system. What is is used for specifically? Is this to ensure you know what the maximum/minimum spacings for high voltage/current contacts/embedded features?
I work in FA, so I don't get the chance to play around with electronics like in my previous position lol. Thanks for the video
Spark-gap transmitter.. An extremely old type of circuit to generate radio frequency emissions. Transmitters like that were used on the Titanic, or generally in that time period to send Morse code signals around the world.
Very nice.
Is the output a high frequency pulsed DC?
It's not really pulsed DC, but not entirely free of AC superimposed on top of DC either. There seems to be a 40 kHz distorted sine wave riding on top of the continuous DC output. Sorry for the late response, actually had to put a scope on the output :)
Hello what is the model of the power supply? I didnt know laser power supplies could vary the voltage....i thought only current. Interestinf
It's a VEVOR 50W CO2 power supply
So we're you able to control only voltage with this without changing the current? I'd like to use this for an ion experiment in a vacuum, but my fear is that once the gas ignites the voltage will drop drastically to maintain the current setting when voltage is what I care about more than current.
Great video. I'm interested in replicating your power supply for use in an electrospinning device that requires between 10 - 30 kV. However, most commercial power supplies (such as the SKE EF020) limit current to around < 1 mA. Is it possible to reduce the current in your design whilst maintaining high voltage?
You can limit the current to 1 mA by adding a current limiting resistor in series. Just make sure its appropriately rated for the voltage and the dissipated power.
@@BalticLab Okay I'll give it a go! Thanks for the reply!
Looks like the top cover would be too close to the fan.
Conventiently, the cover has plenty of slits for cooling. Should have probably shown that in the video. Thanks for pointing it out!
@@BalticLabQuite atypical of a rackmount chassis, the top and bottom normally wouldn't be vented as they would be blocked by other rackmount devices.