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Thank you very much. I haven’t looked into what impact the inductance has, but these solenoids normally operate at 24 V AC for an hour or so solid at a time. We will be operating them at half staff

As part of valve testing I ran some ballpark tests with variable PWM drive of the valves I have. The reason for this is, in the case the solenoids get hot enough to be of concern, this would provide a

thanks!!!

I’ll add the additional analog input connections… also connections for serial port lines and a spare I/O or two. Sent: Friday, March 27, 2020 4:18 PM To: [email protected] Subject:

ASHAR -- is there any reason that you cannot provide at least a solder connection for a WIRE to go to A6 or A7 analog inputs on the Arduino?? Those could be used potentially for the flow sensor input

Exactly… I’d love it if someone wanted to get started on the through hole version. At this time, my focus is on the mixed smd and through hole approach. B Sent: Friday, March 27, 2020 3:58 PM To:

so how much of our pressure in cm of water do we lose??? We may not have a huge amount to spare. Don't we need a DIFFERENTIAL pressure sensor to measure the pressures on each side of the obstruction?

Bob: My 2 cents... 1. Do a (mostly) SMD layout first. 2. Do a (mostly) through-hole layout next. 3. Add pads on both boards to add I2C pullups when/if needed. James

Jack: That's what I was implying as was done by Jerry on the uBitx si5351 driver. And, yes, the paring down can be done when it looks like it will be needed. James

Well I’m not much of a code guy (as Jack can probably tell you) but Jack, Ashhar, and other sure are… and they can probably make it hum as long as I give them the right equations to use to

Background. Calculations for wedge or orifice meter from Bernoulli’s equations reduce to: AIR =======>A1,P1-->A2,P2-->===== Flow, Q Q = A2 * [ 2*(P1-P2)/(Rho * (1-A2/A1)^2)]^(1/2) … Where, A1 >

Hi Ashhar, Joy! Schematic looks much better with the symbols. I’m now continuing with the layout… making additions to the schematic as well based on my review posted earlier today, copied below…

Thanks Gordon. I designed these to the specs published on the Open Source Ventilator Project web page but they can be adjusted as needed. The exception is the AA valve where it's tough to get below 1

thank you for that photo and explanation! [email protected]> wrote:

Thank you for doing that work! Sem Lampotang has been working on the specifications and can better address the pressure figures you gave for the anti-asphixia valve. For PEEP I am pretty sure that

the cache is not email-able due to some gmail security issue try this https://drive.google.com/file/d/1mMqth2ewlGS4opDgqffiYugLFB6kwsOQ/view?usp=sharing - f

I've completed design, print and first test of the prototype? AA and PEEP valves. Both are poppet valves with 3D printed assemblies that fit into the center of 1" PVC pipe Ts.? The valve seats are

I'm digging in on Ashhar's design as attached here... this is a mixed through hole and SMD design. A bunch of missing symbols due to missing cache file, but most of what I need to reconstruct is

If we do our part, then the way will be easier. That involves having pressure and flow sensing and appropriately using it in our systems. We should be able to meet the requirements. We can't do a year

I think those FDA specs are going to have to change if this thing deepens. Do you really think the FDA wants 10,000 protestors screaming "You killed by grandfather with your rules!" Milton Friedman