0-30V/0-7A power supply unit with LM723 and Arduino volt and ampermeter

Posted on Thursday, July 27th, 2017 in power supply by DP


Nicu Florica has been working on a power supply project, inspired by Albasete’s power supply unit with LM723 and Arduino volt and ampermeter:

It use an Arduino nano board with i2c LCD1602 display, a active buzzer for indicate shortcircuit case. Also, I put DS18B20 temperature sensor and relay for power a cooler when tenmperature is bigger than a threshold level.
For albasete version, I write psu_reber_ver3ro.ino sketch. In this sketch I put value for albasete case (R1 = 1k put between GND and A1 port, R2 = 39k put between +OUT and A1) and value for threshold (temax) and hysteresis value

See the full post and more details on his blog, Arduinotehniq.

This entry was posted on Thursday, July 27th, 2017 at 11:56 pm and is filed under power supply. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

2 Responses to “0-30V/0-7A power supply unit with LM723 and Arduino volt and ampermeter”

  1. Max says:

    This is of course no “0-30V” supply – the single-supply standard LM723 schematic can’t go all the way down to zero, which is why I could never see these as “proper” bench supplies. The original sources quoted readily acknowledge this, calling it a more truthful “1-27V” supply. The whole thing is even more amusing given there’s a second transformer used anyway, just to power the Arduino, which could have helped pull the reference ground below zero, resulting in a true “down to 0V” supply.

  2. KH says:

    So Romanians use old ICs too, a bit reminiscent of Dilshan’s projects.
    I’m vaguely disappointed by the liberal use of float data and float calculations. Young ‘uns these days have it so easy… and a I2C LCD display too, very luxurious compared to the old days.
    One thing, if I built a project like that, I would be irresistibly curious about the accuracy of V and I, especially that large block of 4 R in parallel, and would insist on calibration.

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