Search results

Hi Just a quicky... is it possible to have two different random numbers in a loop? Rick

Thanks Alan and Hippy, I think I follow your drift, Alan I do like the lookup table as a concept and I think I'll will use it. Hippy, as ever your sheer depth of understanding flumoxes me! I'm trying to get my head round your code examples but, as before, I am just a 'bear of very little...

Umm thanks Alan, for the comment concerning my PCBs. A look up table seems to be a good way forward! I didn't notice that if I swapped B & D I'd get the origional ABCD arrangement. But whatever the 'real' sequence turned out to be I could have used your method! Look up tables are new to me...

Hi Two major flaws that require a PCB redesign. The anode driver above and the schoolboy error of not double checking the ABCD inputs to the CD4028. I read ABCD when the datasheet clearly say ADCB! Still can't quite believe it. Are there any other major or minor things to upgrade or...

OK I've read and internally digested what you have said. It all seems fine and thank you for your assistance? I will make a test set up on breadboard to test the circuit, attached. I'll not use the resistor in the PNP's collector as it would require a faitly major change in the PCB. Although...

ok I'm going back to the drawing board... I'm going to build the circuit on breadboard, just as I should have done in the first place, and do some exhaustive testing. It's not going to be pretty but it should be thorough? Any encouragement would be greatfully received. Rick

Hi, Well its a clock with six tubes but I'm planning to light just one nixie at a time and multiplexing. This circuit is the one that selects each tube anode to light that specific tube, so only one 15k resistor. My 15k resistor is a 2W one for head-room. The high voltage is set at about...

Thanks Alan, I missed an important bit out of my schematic a diode and a 15k resistor These are shown in the updared schematic, attached. I'm thinking that, that will change the situation somewhat? Do you think that maybe I should replace all four resistors with 1k0 1/4 Watt resistors? Rick

ok I'll try again.

Hi Folks, I've been kinda busy so it's been a while since I've posted. I've put together my clock running a test program but unfortuneately it doesn't seem to work. I've run some tests and I'm thinking I may have incorrect resistor values for my highside, high voltage, NPN/PNP switch? I've...

I'm sorry Hippy but I'm just not up to understanding your code! Perhaps you could talk me through the use of the DIR command I just don't seem to get it? In fact if you could talk me through all of it that would help? I've tried googling it but without joy. Sorry to bother you but I think I...

Hi Still trying to sus out your code Hippy. Another aside though, I'm using optoisolators to switch the high voltage anodes for multiplexing but I'm having doubts about them? I'm wondering if I would be better off using a PNP driven by a NPN transistor for each digit? This would take up more...

Hi Hippy, I've looked through your code and I'm kinda confused. There are concepts which I am not at all familiar with! Like the #Macro, I haven't used the dir command before and neither have I used the STROBE command, nor the do/loop. That said perhaps you could help me turn my idea into...

Thanks John, I did have a look at that RTC module and I think I've got one hanging around, but it has slightly different pin-outs so I couldn't just substitute it in my PCBs. Thinking about it though it wouldn't be a major job to change the wiring... I'll have a think? Hippy...There seems...

Hi Hippy, Well that was a pleasant experience perhaps can do, can do, can do or perhaps could do, could do, could do? I could provide the schematic but as you know its on a strictly need-to-know basis and I don't need to know so can't provide it! I could provide the PCB design though. I can...

OK cool. I've produced a 'proof of concept' to drive the Nixie's, admittedly with a couple of CD4017's but it works as designed. So that's the HV side out of the way, except switching the Anode, which I didn't test! I think I'll test the multiplexing on the first prototype of the clock...

Hi, I'm in the process of designing a PICAXE40X2, Nixie Tube clock. Instead of driving the Nixie Tubes with a dedicated IC, I am using the CD4028 BCD to decimal converter and utilising high voltage SMD transistors. I am planning on multiplexing the display which involves switching the high...

Interesting Hippy Having used the NE555 more than a few times its particularly interesting that I didn't notice that exactly the same applies to it, too. We live and learn. Rick

Good to see good old fashioned humour is not dead yet either! Rick

Thanks all, especially Phil! Like the exhaustive answers to a question that was never actually asked! Good to see attention to detail is not yet dead! Just to double check, the RESET pin should be labelled Řēšēť? Or not? Rick