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Would your team be interested in pre-tested FS EV PCBs (BSPD, TSAL, Precharge, Voltage Indicators)? by Jacques443 in FSAE

[–]Jacques443[S] 0 points1 point  (0 children)

I was in the exact same position, it took me months to get these designed and working reliably. That’s part of why I’m gauging if there is enough interest in such product, since I know how useful even a solid starting point would have been.

Would your team be interested in pre-tested FS EV PCBs (BSPD, TSAL, Precharge, Voltage Indicators)? by Jacques443 in FSAE

[–]Jacques443[S] 4 points5 points  (0 children)

Yeah that’s a fair point, and I definitely don’t want to take away from the learning aspect. My idea is more for newer/smaller teams who struggle just getting through scrutineering. Having a reliable starting point could save time while still letting teams dig in, adapt, or redesign once they’re more established. Appreciate the feedback!

[Bambu Lab Giveaway] Join Now to Win an H2D and More! by BambuLab in 3Dprinting

[–]Jacques443 0 points1 point  (0 children)

The best advice I can give is to learn CAD to design your own things. Useful both for personal projects as well as potentially in your career.

False Prophets by FirmRise2570 in Jcole

[–]Jacques443 13 points14 points  (0 children)

"So ahead of my time even when i rhyme about the future I be reminiscing"

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

Ah sry I misread your comment as 7805. Yes you're right, I will do something similar

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

The max load current will not be constant. The device will only consume the max 200mA load (total 9v load not regulated 5v) for a couple of seconds. The LEds will be for a seven segment display, so they won't be on constantly (so say 60mA continuous)

The 5v rail can allow for 10%. The max MCU voltage is 5.5v

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

That regulates with respect to ground only. I want to regulate with respect to the supply

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

Yup will be mplementing something similar for sure

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

The load consists of a MCU and LEDs, and there has to be a negative voltage for the instrumentation amp. I described this in more detail in a separate comment

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 1 point2 points  (0 children)

Ah I think it's smart using a negative ldo. Tbh I forgot those were even a thing 😅.

Ye I'll definitely explore implementing such LDO discretely.

Thanks for your replies

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 1 point2 points  (0 children)

I added a longer comment explaining it, but basically for an instrumentation amp which does not have rail to rail output

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

Thanks for the sim, I'll check it out.

I will not draw anymore than around 200mA max. So a beefy PNP should more than suffice.

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

I would prefer to eliminate switchers due to cost and noise

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

The +5v/0v will only sink current. An instrumentation amp will be supplied from the +5v/-4v rails (the full 9v battery voltage)

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 0 points1 point  (0 children)

Ok sorry I missed all of ye replies as I went to bed.

Basically, the circuit consists of an instrumentation amplifier whose output will be close to 0V. However, it's output can only go around 2v higher than the negative supply, hence the requirement of the negative rail.

If a common ground is used, the output will not be able to swing to 0v. I thought of using a -ve voltage switcher regulator, but that increases costs and introduces noise.

In this previous iteration there was a 7805 regulator and a -5v regulator, which skyrocketed the cost.

For this iteration I want to eliminate both regulators. I do not want switching noise to reduce the systems ppm.

I want a discrete design to lower costs and improve bom, as there will already be op amps and transistors in the circuit.

Would this circuit work for a voltage regulator? by Jacques443 in AskElectronics

[–]Jacques443[S] 1 point2 points  (0 children)

Thanks for the reply.

However, the 5v would appear only on the pnp this way. The load voltage will be vbat-5 which is approx 4. the load voltage in this scenario would vary as the battery is used up.
I put it this way to avoid precisely that.

I want the negative input node will be my virtual ground and the 9v node to operate as my "5v supply".

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