Fusor Forums

Hi Pierre, I'd recommend using a dedicated driver IC for this rather than designing it totally from scratch. Earlier in this thread the an Infineon IC is shown. Alternatively you could rip-off large parts of the circuit from a commercial design, for instance see the manual in this post . You might a...

If anyone is around in the Bay Area next week and would like to meet up please let me know. I'll be in Palo Alto.

I'm usually in London, so likewise, if anyone wishes to meetup in London I could usually make that.

Cheers
Chris.

Hi Arun,

that all sounds good. Are you sure that you have the pinout correct? For instance, try the 2 checks i mentioned before.

regards
Chris

Hi Arun use your voltmeter to monitor the PSU voltage, i.e. between pin 6, 7. See if it dips noticeably below 80V when you press the start switch. Looks like your PSU is working OK according to your tests. The manual says max current is 1.1A, which could well be when it is first energised. If it is ...

Hi Arun, please connect your DMM as shown in Rex's diagram and report back what you measure. This is the Output of your DC-DC converter. If you only have one DMM, then you can measure the voltage and current in two separate tests. Leave pin 2 disconnected. Also can you draw a schematic diagram that ...

Hi Arun, I recommend that you get comfortable with how to measure voltage and current first and experiment with how the voltage and current limit settings work on your PSU(s). You can do this by using some resistors and experimenting with the PSU at low power, say < 10V and < 0.5A. This will be usef...

Hi Arun are all of those figures measurements or programming settings? With power supplies that allow you to set the current and voltage they can run in constant voltage or constant current mode and this may not be obvious. The settings work as limits, i.e.: - if you set the current at a value lower...

An example: http://www.ti.com/lit/ds/symlink/tl494.pdf If you want to identify the chip, I suggest finding out which are the VCC and GND pins and matching that to various 16-pin controller ICs - look for the most common / cheapest ones. Once you have identified the chip then you would stand a better...

Hi Rich, there are two types of caps which might need replacing: 1. the 'X' and 'Y' caps which are on the AC line input as a filter. 2. the electrolytic smoothing caps on the DC lines to the amp If #1 fails they can explode, see here for instance. However, that mainly seems to affect the common type...

I sent the seller information on how to check the filaments I see in the manual for the 354 gauge that it shows you can check the two filaments are 0.2 Ohms and the Grid 0 Ohms (p43 of service manual). I haven't got round to using my gauge yet (RS485 bit of a pain & I dont have my high vacuum stage...