OK, that was quick. Opened the box, all parts appeared to be in good shape, but no documentation of any kind. If I could prevail on the other builders for a copy of the instructions/schematics, it would speed up my build.
Thanks; -Bill- On Friday, May 21, 2021 at 6:23:56 PM UTC-7 Bill Stanley wrote: > Toss another kit on the barbie.... > > My kit arrived today so I will be building it over the weekend. Watching > the comments closely. > > -Bill- > > > On Friday, May 21, 2021 at 5:14:24 PM UTC-7 gregebert wrote: > >> I have an Aneng UT61e; cheap but quite good. One of my scopes has a pair >> of 100x probes that lets me look at a few kV, but I was too lazy to bring >> it up today. If I run into problems I'll post some screenshots. >> >> After installing the diff-amp transistors and Q1, current-drain increased >> to 360mA. >> >> I suggest you bench-test your power-supply board by itself first; >> disconnect all cables, and jumper J5-4 and J5-5 together to enable the HV >> supply. Make sure all generated voltages are correct, especially the 300V >> supply (should be around 305V per the instructions). >> >> On Friday, May 21, 2021 at 4:10:55 PM UTC-7 John Snow wrote: >> >>> Paying full attention - what model DMM do you have if you can't directly >>> connect it? I have an 87V I'm happy to connect as it's rated for 1KV. >>> >>> On Friday, May 21, 2021 at 11:38:27 PM UTC+1 gregebert wrote: >>> >>>> UPDATE 1: I built the power supply/driver board and completed some >>>> basic testing. I installed all components EXCEPT the transistors for the >>>> diff-amp that drives the CRT. The standby current at 12V is zero. The HV >>>> supply can be enabled by grounding the POWER_ON signal; that causes the >>>> inverter to run and the current is 170mA. The neon bulb is on and it's >>>> supply is 306V; the +5 and -5 supplies also work. The filament supply >>>> voltage on my scope is about 500kHz, somewhat sinusoidal, and about 17V >>>> pk-pk, which is about 6.3 Vrms for a pure sinusoid. The HV is beyond the >>>> range of my DMM so I had to put a 10meg resistor in-series to double the >>>> range (inaccurately, because it's a 10% resistor) and measure around 1270 >>>> VDC. >>>> >>>> Next step is to build the other board. Stay tuned. >>>> >>>> On Thursday, May 20, 2021 at 7:34:52 AM UTC-7 John Snow wrote: >>>> >>>>> >>>>> I've been checking over solderjoints, hoping to find a Q or U with a >>>>> solderbridge, no luck. >>>>> >>>>> Ah, I hadn't made the connection - I found your build guide before, >>>>> it's what made me decide to order one. It's been useful for making A or B >>>>> comparions for anything standing out. >>>>> >>>>> I've also been checking over the circuitboard hoping to find a Q or U >>>>> inverted, but they're all following the soldermask guides. >>>>> >>>>> There's no breakout for and ground VCC_300 to easily probe? >>>>> On Thursday, May 20, 2021 at 8:10:06 AM UTC+1 Paolo Cravero wrote: >>>>> >>>>>> John, >>>>>> pictures of my build are here: >>>>>> https://ik1zyw.blogspot.com/2020/10/kit-oscilloscope-clock-8sj31j-review-3.html >>>>>> >>>>>> The code on the HV board is the same. I think I reversed a 79Lxx, but >>>>>> the smell of it burning was too obvious and I cannot tell what the >>>>>> effect >>>>>> was on the CRT. >>>>>> >>>>>> I do get intermittent failure probably caused by a cold joint at a >>>>>> ground point that was not designed with thermal relief and it took me a >>>>>> while to solder. >>>>>> >>>>>> Paolo >>>>>> >>>>>> >>>>>> On Thu, May 20, 2021 at 12:49 AM John Snow <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> Hi Paolo, >>>>>>> >>>>>>> no filament glow after one minute powered on, >>>>>>> >>>>>>> both fuses continuity checked, they've not blown >>>>>>> >>>>>>> I'm getting 60V across the indicator bulb. >>>>>>> >>>>>>> Which voltage regulator did you reverse? >>>>>>> >>>>>>> -- >>>>>>> >>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "neonixie-l" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to [email protected]. >>>>>>> >>>>>> To view this discussion on the web, visit >>>>>>> https://groups.google.com/d/msgid/neonixie-l/3f6e2a4a-ed6d-485d-9ccc-a0dfc157b451n%40googlegroups.com >>>>>>> >>>>>>> <https://groups.google.com/d/msgid/neonixie-l/3f6e2a4a-ed6d-485d-9ccc-a0dfc157b451n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>>> . >>>>>>> >>>>>> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/cccf50e1-f8bd-4b6e-a5ea-98e05e945f7cn%40googlegroups.com.
