Connect with us


The No-MCU Fan Controller | Hackaday



The default for any type of control job below in 2019 was to grab a microcontroller. Such are their inexpensive and also universality that they can be utilized to reproduce what could as soon as require some additional wiring, with the minimum of components. However below we go to completion of 2021, and also obviously microcontrollers are difficult to find by in a semiconductor lack. [Hesam Moshiri] has a task that takes us back to a less complex time, a temperature controlled fan the way they used to be made, without a microcontroller in sight.

Old-timers will certainly no question assumption where this layout is heading, there is an LM35 temperature level sensing unit creating a voltage symmetrical to its temperature level, and also fifty percent of an LM358 which develops a comparator versus a fixed voltage from a divider panel. The LM358’s outcome drives a MOSFET which consequently turns on or off the follower electric motor. This kind of circuit utilized to be the day-to-day price of straightforward control electronic devices in the days when a microcontroller stood for a substantial expenditure, and also it’s still a helpful circuit to be advised of.

Have you failed to remember sensing units such as the LM35 in a globe of on-board sensing units? Time to rejuvenate your picking up memory.

Continue Reading
Click to comment

Leave a Reply


Homebrew Circuit Explores The Mysteries Of Analog-to-Digital Conversion




When it concerns obtaining signals from an analog globe right into our computer systems, the majority of us do not provide much idea to just how the equipment that gets the job done functions. However as it ends up, there are a variety of means to skin the analog to electronic conversion feline, and also building your own homebrew successive approximation register ADC is a wonderful method to resolve several of the secret.

From his summary of the job, it’s clear that [Mitsuru Yamada] had not been seeking to construct a sensible ADC, yet was extra thinking about what he can discover by rolling his very own. A succeeding estimation register ADC functions by rapidly cycling via all feasible voltage degrees in its input variety, at some point zeroing in on the voltage of the input signal then and also outputting its electronic depiction. The video clip listed below demonstrate how the SAR ADC functions aesthetically, making use of an oscilloscope to reveal both the input voltage and also the outcome of the inner R-2R DAC. The ADC has an input variety of 0 V to 5 V and also 7 littles resolution and also utilizes only generally readily available 74xx collection reasoning chips and also a number of conveniently sourced analogs for the sample-hold and also comparator area. And also customarily with among his jobs, the construct high quality and also handiwork are remarkable.

We enjoy these type of jobs, which are embarked on just for the happiness of structure something and also discovering just how it functions. For even more of [Yamada-san]’s jobs, look into his 6502-based RPN calculator, or the serial terminal that must have been.

Continue Reading


%d bloggers like this: