Electronics idea.

There are opamps with bipolar junction transistors (BJT) in the input stage.

There are others with junction field-effect transistors (JFET) in the input stage.

There are yet others with metal-oxide semiconductor field effect transistors (MOSFET) [1] in the input stage.

Idea: find an application for the bizarre possibility of an opamp with insulated-gate bipolar transistors (IGBT) in the input stage. This is more stunt-designing than anything practical.

[1] IIUC, "CMOS" opamps are really just MOSFET-input opamps. I'm not sure why the process technology name is more commonly used rather than the device type as is universally used for BJT and JFET input opamps.

#OpAmp #electronics #OperationalAmplifier #JFET #BJT #MOSFET #IGBT #CMOS #stunt

It takes a lot of #chutzpah to sell μA741 opamps for $2 each plus shipping.

#μA741 #ua741 #opamp #ripoff #OperationalAmplifier #741

This will be slightly #geeky, and probably only of interest to #electronics hobbyists and #guitar players. I happen to sit in the intersection of that particular #Venn diagram.

When I was a teenager, having only been playing guitar for a few years, I owned a guitar #effects pedal that went on to become legendary - the Boss HM-2 "Heavy Metal" #pedal. Its sound is still ubiquitous in metal.

I don't have it any more. I think I traded it for an analog chorus, which was a seriously expensive pedal back then. Although I have other #distortion effects, I've missed it a lot over the years.

Well, lots of hobbyists build their own effects. And the circuit schematics for many effects, particularly the classics, are available online. So like many others, I decided to build my own HM-2.

This image is the schematic for the #HM2. It's not the most complicated pedal, but it's a league above something like an Ibanez Tube Screamer. As far as active devices go, it's got 6 #opamps and 10 #transistors of various types, along with a bunch of diodes for multiple types and stages of clipping, and the usual jumble of capacitors and resistors. Oh, and four potentiometers.

1/x

#EffectPedal #HeavyMetal #pedals #metal #DIY #schematic #circuit #hobby #OperationalAmplifier #TubeScreamer

DIY guitar distortion effect pedal with ESP8266: construction, use and adjustment

https://www.techrm.com/diy-guitar-distortion-effect-pedal-with-esp8266-construction-use-and-adjustment/

#1N4148, #2N2222, #amplifier, #analogue, #analogueelectronics, #breadboard, #cutofffrequency, #digitalpotentiometer, #diode, #distorsion, #Dupontcables, #esp8266, #filter, #invertingamplifier, #LM386, #LM833, #lowpass, #MCP41010, #opamp, #operationalamplifier, #oscilloscope, #platformio, #potentiometer, #resistor, #speaker, #transistor

Sound engineering: build your own low pass op amp filter with adjustable cutoff frequency with digital potentiometer

https://www.techrm.com/sound-engineering-build-your-own-low-pass-op-amp-filter-with-adjustable-cutoff-frequency-with-digital-potentiometer/

#amplifier, #analogue, #analogueelectronics, #breadboard, #cutofffrequency, #digitalpotentiometer, #Dupontcables, #esp8266, #filter, #invertingamplifier, #LM386, #LM833, #lowpass, #MCP41010, #opamp, #operationalamplifier, #oscilloscope, #platformio, #potentiometer, #resistor, #speaker

DIY Metal Detector Gives You The Mettle To Find Some Medals

Hurricane season is rapidly approaching those of us who live in the northern hemisphere. While that does come with a good deal of stress for any homeowners who live in the potential paths of storms it also comes with some opportunities for treasure hunting. Storms tend to wash up all kinds of things from the sea, and if you are equipped with this DIY metal detector you could be unearthing all kinds of interesting tchotchkes from the depths this year.

The metal detector comes to us from [mircemk] who is known for building simple yet effective metal detectors. Unlike his previous builds, this one uses only a single integrated circuit, the TL804 operational amplifier. It also works on the principle of beat-balance which is an amalgamation of two unique methods of detecting metal. When the wire coils detect a piece of metal in the ground, the information is fed to an earpiece through an audio jack which rounds out this straightforward build.

[mircemk] reports that this metal detector can detect small objects like coins up to 15 cm deep, and larger metal objects up to 50 cm. Of course, to build this you will also need the support components, wire, and time to tune the circuit. All things considered, though it's a great entryway into the hobby.

Want to learn more about metal detecting? Check out this similar-looking build which works on the induction balance principle.

#classichacks #news #circuit #coil #metaldetector #opamp #operationalamplifier #oscillator #simple