Hi, I doubt it when You say, "you can omit connecting the suppressor diodes common pin when not using indictve loads". I have done exactly that just because of couriosity on my latest clock build. It was on a high side driver. Anyway. IF the diodes could be pulled out of the circuit that would work. By not connecting the common pin to Vcc it makes an OR-gate out ouf the INTERNAL diodes. Watch the multiplexed outputs simultaniously altering when done on a clock. The number digits start blinking at the frequency of the seconds LED, fed through the same chip.
Hi, see my U125D based clock. Initially it had used an integrate high side driver. The UTC 62783 is suffered from not fully shutting off the unused digits on a multiplexed clock. This results in ghosting on the LED displays. The Toshiba IC TBD62783AP is said not being suffered from this bad behaviour But I had none on hand. I replaced the 62783, a counterpart of the well known ULN2803, with a number of discrete transistor drivers. @@LewisLoflin Works much better.
I am curious about how it would work to go: uC -> Photocoupler -> ULN2003 or similar. what does VI(on) ON-state input voltage mean in the spec sheet? the ULN2003 has a max of ~3v, but it can be driven from a 5v uC. What does this all mean?
Hi, I doubt it when You say, "you can omit connecting the suppressor diodes common pin when not using indictve loads".
I have done exactly that just because of couriosity on my latest clock build.
It was on a high side driver. Anyway.
IF the diodes could be pulled out of the circuit that would work.
By not connecting the common pin to Vcc it makes an OR-gate out ouf the INTERNAL diodes.
Watch the multiplexed outputs simultaniously altering when done on a clock.
The number digits start blinking at the frequency of the seconds LED, fed through the same chip.
I can't say much until I see a schematic of what you did. Connect the diodes to Vcc then. Thanks for the info.
Hi, see my U125D based clock. Initially it had used an integrate high side driver.
The UTC 62783 is suffered from not fully shutting off the unused digits on a multiplexed clock. This results in ghosting on the LED displays.
The Toshiba IC TBD62783AP is said not being suffered from this bad behaviour
But I had none on hand. I replaced the 62783, a counterpart of the well known ULN2803, with a number of discrete transistor drivers.
@@LewisLoflin Works much better.
Thanks mate, very helpful video
Glad it helped
I am curious about how it would work to go: uC -> Photocoupler -> ULN2003 or similar.
what does VI(on) ON-state input voltage mean in the spec sheet? the ULN2003 has a max of ~3v, but it can be driven from a 5v uC. What does this all mean?
Each input has a 2.7K resistor so 5V is no problem.
@@LewisLoflin Thank you! rereading the datasheet with this in mind makes it all very clear.
@@graham8316 You are welcome.
How can known max input IN(Ampe) ?
It is stated in the spec sheets. I derate max by 25%.
This is very useful content. Thanks for sharing
Very nice sir thanks 👌👍
Most welcome
Thanks for the update. Would be great to see a real example using arduino
I have a video on that and will post it.
@@LewisLoflin great!