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[@IanScottJohnston]

Steve, thanks for the review of the prototype and the suggestions. The serial header does work, it's an "extra" feature I wasn't planning on but gave the unit a backdoor. Press and hold the LEFT & RIGHT buttons to enable bidirectional comms, an LED will flash next to the header. I'll send you the protocol...... I should have mentioned, there _may_ be a 1bit error going from Version 1.00 to V1.01 due to the new version cancelling out a rounding error.......so yours might require a wee re-calibration to get the unit even more accurate.

[@PapasDino]

Thanks Steve...nice to see all my favorite YT guys cooperating!

[@UnexpectedMaker]

Great overview Steve! Beautiful build quality @IanScottJohnston :)

[@IanScottJohnston]

Cheers Seon, I spend stupid amounts of time tweaking this and tweaking that to get it how I like it......!

[@OrbiterElectronics]

Thanks for the review Steve 👍

[@DustinWatts]

Great product! Thanks for pointing it out to us (me)!

[@robertcalkjr.8325]

Thanks Steve! It looks like a nice voltage reference.

[@GnuReligion]

Wow ... now I am going to obsess for a few days figuring out how this was made.

[@mourneris]

Toggle Output could be implemented with a firmware update. Use the "Enter" key to toggle output on & off. Add a little indicator on the screen to show when output is on or off. Easy little update which would make this nice.

[@The.Doctor.Venkman]

Very nice device. Thanks for the review :-)

[@GlobalServicekit]

как приобрести ?? buy ?

[@davidprice2861]

Good cheap voltage reference? I use my Fluke multimeter!

[@zachreyhelmberger894]

I definitely want to purchase one! Is there a link?

[@IanScottJohnston]

Go to www.ianjohnston.com and enter my SHOP and you will see the product there. Use the Notify Me link.

[@mohamedsadam6062]

There also was amp meter to it would be nice.

[@paul-c7541]

£264 in the UK I feel still out of reach for the ordinary working hobbyist, very nice though for those who can afford one and have a use for it.

[@jvandervyver]

I'm guessing this product is essentially this: kzbin.info/www/bejne/jGrPZp6ZlNSSmqM But with a more accurate DAC and more expensive reference. Quite a bit of money for that. Guess you are paying for development & calibration. Personally I'm inclined to build the above just because it is such a fun little circuit

[@davestech6357]

Did I miss but what is the current output of this? Looks way too fragile for me to use. I would like to see it with a encoder instead and a back light would be nice too. I would change your charge current if that 400 Ma is in series with those batteries. If they charge in parallel that would be ok.

[@IanScottJohnston]

This is a cheaper version of my PDVS2 (see my online shop) which has the encoder, backlight and a numeric keypad. The output is short circuit protected (21mA max all day long), Min load = 3kohm. Example: At 10Vdc output with 3kohm load = 3.3mA (whilst maintaining output within approx. 10uV) The 400mA is a software setpoint just to protect things if the batteries/hardware goes wrong.....the max charge current is set at 225mA approx. The batteries are in series. I chose the PP3 type as they come with in-battery over and under charge protection, i.e. I have added as much protection as I could in hardware & software given it uses Lithium-Ion batteries. (PS. I will change the text on the 400mA setpoint so it's more intuitive as to what it's for.....or maybe even remove it fom the display!).

[@davestech6357]

@@IanScottJohnston Thanks for the info I will check out your site. Sounds good and that display looks awesome!

[@kaybhee6]

need ac v ref,,, pls suggest

[@buildstoys]

.

[@111chicane]

Would have been a lot more useful with 0 - 15V range. With 0-10 he lost me as a customer, dealing mostly with automotive 12v . This will be handy for analog device testing, most of which are 12-24V. The way it is, I only see one small niche for this device, ADC testing.

[@marcus_w0]

So, this isn't the product for you. Do you blame Ian to not think about you, when he was fulfilling his needs on a voltage source? This is not a product, it's just a way to get a well built and tested piece instead of making it your own, according to the plans and videos, he's provided. Go get those, and make it fit your needs.

[@IanScottJohnston]

Hi, 15Vdc would mean you wouldn't get the 5th dp due to the 20bit DAC (10uV steps 0-10Vdc). Also, two PP3 batteries wouldn't be enough very likely thus major changes required. 0-10Vdc just lands perfectly to the hardware/design. However, I wouldn't rule out a future design for say 0-24Vdc or something like that.

[@111chicane]

@@IanScottJohnston I completely understand the reasons behind the current range. I figured you'll need more than 20 bit DAC but what I also wondered was, why not use a single battery and DC-DC converter? I'm assuming the battery won't last long enough? Noise? Thank you for your respond and best of luck with your products!

[@IanScottJohnston]

@@111chicane At these small voltages noise and drift is the enemy......DC-DC converters would just cause havoc without going a lot more expensive on the BOM. There are compromizes right, left & centre hence why there aren't too many hand-held precision voltage sources out there......:-)

[@111chicane]

@@marcus_w0 Mr. Marcus, did someone eat your breakfasts? It wasn't me. I did say in my comment it's not for me, go back and re-read it. I'm not bashing or criticizing the product, I'm suggesting it will get a lot more potential buyers with wider range. Hopefully next time you get to your keyboard, you'll restrain yourself of showing anger. Thank you!