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/7d4d2f8a-b19d-404c-aa9f-e4544cb14d18n%40googlegroups.com.
