Mark is correct in all respects. Sometime in the past the 78L05 regulator was removed and presumably the logic was powered externally.
I strongly recommend replacing the 78L05. The board only draws 10-20mA from 5V and using an external 5V supply is a nuisance and an unnecessary point of failure. If you have any trouble getting it going, just ask me. I seldom post here but I keep an eye on the forum. On Tuesday, November 24, 2020 at 9:15:38 PM UTC-8 5-ht wrote: > > > Hi Jeffry, > Your circuit board appears to be missing U1 which is a 78L05 5V regulator > in a 8-SOIC SMD package. > This design originally required a 12-18VDC external power supply > (350-500ma should be sufficient, the coaxial connector is center-pin > positive) but I guess one could power it with separate 5V and 12-18V power > sources. The 5VDC powers the logic and the 12-18VDC the high voltage > generator for the tubes. > The part number for the missing 5V regulator is LM78L05ACM-ND form Digikey > and 511-L78L05ABD from Mouser. > > Mark > On Tuesday, November 24, 2020 at 9:00:00 PM UTC-6 Jeffry P wrote: > >> I have a FLW by Pete Hand that has been in storage a few years and I >> hope the group can help me get it working up and running. The device was >> functional when I put it into storage. >> >> 1) What are the power requirements? >> >> 2) there is a jumper wire dangling off a pin in between the #4 and the >> power connector and I don't know where is supposed to attach. >> >> 3) There was another jumper wire in the box and I'm not sure where it >> goes. >> >> I've attached some pics >> >> Thank you , >> Jeffry >> > -- 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/447806f9-14fb-4ffa-b51d-b9f4dac188b3n%40googlegroups.com.
