In this blog I will show you how to generate pwm with a computer with a serial port. This tool was originally written by subcooledheatpump from YouTube. I made it better where you can choose which com port to use(by command-line or by being prompted to do so). Controlling it is now better since now …
This is the simplest in circuit transistor tester. It uses two ammeters to measure the transistor gain. It is kinda like the heathkit IT-18 one but uses 2 meters instead of one. I plan on using relays for the polarity switch instead of a 5PDT Rotary switch. It uses a LM317 regulator for providing a …
This tool checks the internet connection to see what Internet Provider your using. Good for VPNs and getting your server back online. You can use reconnect.bat file to help fix network problems or alert you when you lost connection or your ISP Name has changed. To make your batch detect first open your command prompt …
It is possible to make the computer talk by a batch file or any windows program. All is needed is a tiny VBScript file that use Microsoft Speech API OLE Object. Also all sentences passed to the command must be surrounded with quotes. Otherwise it will not sound the best. You may download, copy, modify …
Here in this blog i will show you how to build a high powered transistor opamp. The design is based off of allaboutcircuits.com design. The only changes were the transistors were power transistors and rprg is lowered to 390 ohms half watt.
Long time ago QVC sold a shakeable Flashlight that had no batteries just a shakeable generator and a super capacitor. This flashlight uses a 5vdc 1.5a wall wart to charge the capacitors. To figure out how long it will take to charge the flashlight you use this equation $$T=5R_{currentlimit}C$$ And for total discharge time $$T=5R_{LED}C$$ …
In this blog post a crt TV a part and turn it into a oscilloscope. I am going to try to use a TL082 op amp to buffer and amplify the signal. It uses the deflection yoke to draw the picture on the tube. More pictures and videos will be posted here when it is …
This wrist strap prevents electrostatic discharge to whatever you touch What you need: 1 meg ohm resistor(any wattage or tolerance will do Copper tape or foil a piece of wire(you can use all of the wires from a btoken cord if you like0 bracelet(This should allow the copper tape to stick) one alligator clip Step …
This is a very simple esd mat that anyone can build. All you need is Small nail Cardboard box A three prong cord(must be three prong so that it functions correctly) Copper foil sheets that stick(i got mine from eBay, it is used for guitars) 1 meg ohm resistor any wattage should do. Hot glue …
Circuit Simulator