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Tester RJ45 ( without MCU) Muscular Contractor

Like UTP cable tester for RJ45 Ethernet networks that is posted on this blog, this is the difference that requires no MCU or firmware, is developed with conventional digital electronics.
is a testing tool for UTP Level 5 and RJ45 connectors in order to test the pairs for the ethernet standard.
circuit is nothing but developed based sequencer to 4017 whose main function to create a consecutive sequence of sweep between the 8 bit, which varies its speed to 555 by the potentiometer.
The only control you have this tester is the frequency adjustment, which can be done with a common potentiometer or with a preset to shrink.
The circuit is as follows:

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This circuit is a contractor or muscle stimulator.
The purpose of this is educational, because its development was to the study of muscle contraction in terms of power in this case the contractor delivers 2mJ to its output at this level energy we obtain a good contract which I tried in my pain free, if used with appropriate electrodes, in my case I use electrodes which are available online for $ 20 ar.
The circuit operation is very basic, consists of an oscillator and a variable current limiter for the output stage, this output stage is an inverted transformer 220V to 12V 300mA and both the driver and the control processor limitation outlets are developed with a TIP31C each.
The 555 is responsible for generating the pulses to be monitored in the series that has led to his departure, thus leaving the control frequency and control of these same intencidad be adjusted for treatment area.
NOTE: Keep use criteria.
Then leave the same circuit.

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FanSpeed \u200b\u200b- Vairador speed for cooler

This simple circuit consists of a fan speed controller for PC or for the cooler, the drive circuit is very simple and most common, all you have added is a digital measuring instrument layered with integrated KA2284.
The circuit is the next and the same video shown on the YouTube channel of this blog.

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This circuit was provided by the manufacturer in its integrated LM3915 datasheet, but it modified the input signal power.
The circuit is basically the same that gives us in his Datasheet National.
then show you your circuit and the YouTube channel is in this blog, Vu is a video from working.