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yes, that's most certainly ИВ-9 (iv-9) and 9104 is probably the manufacture year and month. There are datasheets online (in Russian) with pinout and operating conditions...the nominal voltage is 3.15v per segment, etc etc. if you pulse those, there are certain frequencies you should avoid.

Are those numitrons the USSR-made ИВ-xx series?

according to its datasheet, the output at 70C of LZC-C0U600 collapses to 50% of what it does at 25c. the situation with the 4-die uv led is about the same as they are obviously using multiples of the same 365nm chip. For those who want to squeeze the last mw from the poor sucker, the heatsinking...

how about using a 50v power supply, 24-50v boost or something similar?...

how long does it take to charge 15 cells?

74HC123 can do the job and it's a cheap jellybean part...use the TI application note for inspiration

this thing reminds me of my vfd freq counter, but the rats nest wiring i did is on a much much smaller scale so it can count 200MHz with standard cmos chips. I made a small push-pull boost cct with 74hc132 to boost 5v to 20v for the vfd anodes.

the purple glow looks 400nm-ish

Re: The "Clean Edge" Driver - 2.85A driver for 462s - want to review/test? Bulgaria. But I don't have a Flir.

Re: The "Clean Edge" Driver - 2.85A driver for 462s - want to review/test? floodlights and burning pasta aside, it means that the scope can digitize and store large amounts of data and visualize transient events such as power-up transients as well as HF switching noise superimposed on the output.

Re: The "Clean Edge" Driver - 2.85A driver for 462s - want to review/test? whats the topology of that driver? i do have 2.5, 5 and 10GSa DSOs + specan, but you'd have to ship overseas.

the mcpcb of the 4-die led is smaller, but i could still solder wires to the pads with a regular 80-watt weller w/o hot plates just fine. your life would be easier if you find low melting point solder wire

the thermistor is this one: B59901D0060A040 yes, the vref output provides 3.3v with limited current source capability. edit: how's your jumbo led design going?

I mounted the 4-die led to this chunk of aluminum. the Recom brick with some extra rfi filtering and esd protection is tucked in the cavity of the heatsink. There is also a PTC thermistor bolted adjacent to the led. The current to the led rolls off rapidly above 60c, but with just 10W dumped...

and im using a buck (zxld chip or a recom) and a 24v brick psu for the lz4. i can't see a thermistor pad on that mcpcb. you have to figure out how and where to blob it and allow for thermal gradient in the compensation network cant wait to see your first light with that thing...

i was talking about putting your new 12-die toy in a flashlight host and driving it off of 1 lipo cell. I somehow doubt it would work

35w of waste heat is awful lot of power for a flashlight host to handle. and the boost driver? switching freq in the MHz range, inductors with Isat>10A, switching fets with Rdson in the 2milliohm range and gate capacitance in the 8nF range...wat a monstrosity...

RCD-24-0.70/VREF. it has a reference voltage output, which can be used to power a thermistor dimming circuit.

it would be interesting to measure the led ripple and startup current with a current probe or sample the voltage across a sense resistor in series with the LED. Those uv leds have very limited tolerance for pulsed fwd current overshoot (850mA). i have 3 recoms coming next week and i'll probe...

the recoms seem to have analog control inputs. you could make use of it (and a thermistor)to roll off the led current at elevated temperatures. it only makes sense to pamper such an investment and treat it carefully.