Hoping someone can help solve a problem. Here's my problem.. I have an Arduino (well, a Teensy) in a project which is battery operated and includes a small LCD and an ADS1115. Use is on demand, and is only required for a few seconds at a time, and a handful of times in a short period. And then mo…

Excellent idea. I have a pair of resistor decade boards to use for that.

BTW If we were a purist, this is how the gate resistors should be connected. Either way will work though. [2024-05-15_14-15-27]

[image] LarryD: You could use a Boost/Buck converter also. Why would I use a buck/boost instead of a buck? My source is never going to output lower than the circuit's minimum Vin requirement, so will never need to boost. [/quote] [image] LarryD: Make sure you set the converter output …

[image] stiebs: I was intending on applying a drop of glue/nail polish onto the pot once set, but I do like your SMD resistor idea. That type of potentiometer is open to the surrounding, adding glue/polish will probably destroy it. These potentiometers can be sealed as you suggest though…

[image] LarryD: Why did you decide on the Teensy LC ? I have three TeensyLC boards lying around unused. They're not available any more, so if I didn't already have them I would've chosen a different MCU. [image] LarryD: What LCD are you using with the 3v3 Teensy ? If your LCD is 5v, y…

[image] stiebs: I was going to try and get it all as neatly as possible on protoboard for the final product. FYI [image] Share tips you have come across General Electronics Soft Hold Down Attachment for Component Soldering Further to Post #813 The o…

[image] stiebs: Although given that the Teensy has a regulator onboard, I only need to drop from an input range of 6.6v (new cells and 5.4v (depleted cells) to an input range of 3.7v and 5.5v, a voltage divider at a 4:1 ratio should also do the job? Or a couple of diodes in series to drop 1.…

Updated schematic changing the 2N3904 for an AO3401. Also moved R3 to other side of R2 as suggested. [image]

[image] stiebs: Why would I use a buck/boost instead of a buck? My source is never going to output lower than the circuit's minimum Vin requirement, so will never need to boost. Say we put the two CR123 in parallel (with series Schottky ORing diodes). The output would be fed to the Buck/Boos…

[image] LarryD: Say we put the two CR123 in parallel (with series Schottky ORing diodes). The output would be fed to the Buck/Boost converter set to the required voltage. example: 3V3 We could also use a boost converter. ex. MT3608 I know I suggested putting the CR123 in parallel, but I wen…

Help with a switching a circuit with a "soft" power on button

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LarryD May 15, 2024, 11:31pm 67

FYI

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Help with a switching a circuit with a "soft" power on button

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