hobbyist's Blog

OK here is the situation, I'm experimenting with designing a transistor PWM circuit with current feedback to control motor torque. Everything is working properly, So now I am ready to start measuring voltage and current values so as to determine the best current sensing restance needed in...
hobbyist
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308
As the title says, is it really necessary to decouple circuits from the power rail, here is what I found out while designing some circuits to work together to function as a complete system.
This is a tutorial in designing complex transistor amplifiers at the HOBBY LEVEL. In this turoial you will learn how to bias transistors for switching operations, and amplifying operations. Then you will learn how to DC couple each stage to the next while maintaining testpoint voltages. Then...
I design my circuits at the hobby level, so anybody who has basic knowledge of electronics can get these kind of results too. That's the whole purpose of wanting to help those who are starting out, if I can get these kind of results at the hobby level, than so can you, I want to show that...
hobbyist
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266
Here is a very quick demo of the shop vac water monitor. And my transistor circuit design, schematic.
hobbyist
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500
continuation from last blog. Here are the actual pics on my oscilloscope (usb scope) the green is the output waveform. My real (breadboarded) circuit did better than the simulation. The original amp with no bypass cap put in there across the 1.6K ohm resistor for Q2 emitter. Now with...
hobbyist
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390
OK, Let's actually make an amplifier, with 2n3904 transistors. And lets drive a miniature 8 ohm speaker. First off, an 8 ohm speaker is a very low impedance, however not to worry,,,,we now know how to design DC amplifiers. OK so what do we do,,well we have learned that transistor amps, have...
hobbyist
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268
This is a fun electronics project, to design a circuit to monitor surface water in the basement, during a rainstorm, then automatically have my shop vac turn on and sweep the water up then turn off continually throughout the storm.
hobbyist
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245
In this video, I show how I go about designing a transistor small signal audio amplifier, I explain in detail the methods I use to design each stage using my signal generator and oscilloscope, as well as the details using basic ohms law to calculate the biasing resistors. I show in this video...
I designed and built an all transistor circuit electronic tabletop game for educational purposes of learning transistor circuit design. This is a demo of it finished and being played...
This is the final video in this series, about designing a motor speed control for my minilathe .Here is a quick walk through of the wave forms using my oscilloscope, showing the input through each stage to the output, have fun in the lab.
hobbyist
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478
This is the conclusion of designing and building the PWM circuit project some troublshooting was in order, this video is all about fixing three problem areas with the feedback circuitry. have fun in the lab.
I'm upgrading my motor controle for my 7 x 10 minilathe, I'm converting it from my original class A amplifier analog design with current feedback, to my version of PWM with current feedback for torque control. This is a very quick demo. of my version of design using all discrete transistors...
This is an all transistor PWM with torque feedback control circuit, to run a small capstan motor from a VCR, used for experimental purposes. I'm experimenting trying to see if I could use current feedback in pulses, to control the pulse width output of a schmitt trigger circuit, instead of...
hobbyist
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692
This is a quick video demonstrating the design of selectable latching using all solid state components. I got the idea for this design, after watching another utube channel "philomech", he did an excellent tutorial on the design and build of a system called selectable latching, he designed...
hobbyist
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853
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Hello everyone, I don't know if anyone on this forum has been following my utube channell, for my electronics projects, but if you were, this is an update on the change in channell, my current channell has been changed over to being dedicated to my hobbies in machining and woodworking, and I...
hobbyist
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773
In this video we continue on with our schmitt trigger circuit, we always have a idle, standing voltage at the output of a schmitter circuit, thats going to be around the voltage value of the threshold design value, many times a load needs to be driven from ground reference. So the output of...
hobbyist
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794
Hi, Here is another hobby level transistor circuit design, I went through my course design books looking at the formulas for designing a schmitt trigger circuit, and it explained well all the design equations for the collector,emitter and base to ground resistor, for the output transistor...
Hi everyone, I've been working on a motor speed control for my mini lathe, because the board that I had in it finally blew out, after about 14 yrs. of hard use, I tried to order another one, but my minilathe, is outdated, so I can still get mechanical parts for it, but no more electronic speed...
In this video, I show the details of the design of a simple bar graph, I made some time ago, I show the steps I take to design this circuit, this circuit functions fine for a quick design, however with better chosen values for voltages and currents it can be made to be more sensitive to input...

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