> I am interested in building a IV-11 clock from scratch, and have Maxim 1771s, > inductors around 1000 uH, and IRFD220s on hand but am open to ordering > whatever parts I need. I'm most interested in solutions for generating the > grid voltage, but ideally am looking for a nice circuit for both grid and > filament.
An approach other than an inductor based one is a driver and a voltage multiplier. This was one of the example uses for the LM9022 (click on the data sheet link for more details): http://www.national.com/opf/LM/LM9022.html#Overview Alas, the LM9022 is obsolete, but our own Konstantin has found a possible replacement in the MAX628, now known as the TSC428, a chip designed for FET gate drive, but basically two power amplifiers in an 8-pin DIP. You need an external clock (unlike the LM9022), but pretty much any oscillator circuit will do, a 555, a couple of transistors, or a logic chip rigged as an oscillator. It could also be driven with a microcontroller pin, but that's not the approach you're interested in. This lashup appeals to me - it gives real AC filament drive and grid/anode supply with one chip, doesn't require magnetics, or high speed diodes (1N914s will work fine) and is fairly insensitive to layout - you can construct it on a solderless breadboard and it will work. Alternatively, you could lash up a cheap and common (you can get one at Radio Shack if you're in the states) LM386 as a power oscillator (circuit is in the data sheet) and use that and a voltage multiplier for the anode/grid supply. It's less help with the filament supply, but a single 8-pin DIP is an appealing solution. - John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
