#electronics circuit

[magnificent-mechanism99]

Why does digital elecronics is important for engineering?

Digital electronics is super important in engineering for a bunch of reasons—it's pretty much the backbone of modern technology. Digital electronics powers everything from smartphones and computers to cars and medical devices. Engineers across disciplines need to understand it to design, troubleshoot, or innovate with modern systems.

GET CIRCUIT DESIGNING VIDEO TUTORIAL 👈.

Digital tech allows for very large-scale integration (VLSI), meaning engineers can cram millions of logic gates into a single chip (like microprocessors or memory). It enables powerful, compact, and cost-effective designs.

[dnaayan-blog]

Important Ohm’s Law Problems for Competitive Exams

Series Circuit Resistance

Three resistors of 5 Ω, 10 Ω, and 15 Ω are connected in series. What is the total resistance?

In a series circuit, total resistance is the sum of all resistances:

Rtotal ​= R1​+R2​+R3​ = 5Ω+10Ω+15Ω = 30Ω

Parallel Circuit Resistance

Two resistors, 6 Ω and 12 Ω, are connected in parallel. What is the total resistance?

GET MORE FREE SOLUTION 👈.

[theopiumeater]

[abekiyo]

Fail over circuit

Found good example in internet

Let me introduce an improved version of a blackout alert beeper, which is, in fact, a low-cost mains failure alarm designed to help protect stock and equipment. This device, extremely useful when you are away and need to be alerted, can be used in all types of domestic and commercial applications as it sets off a noticeable

alert when the electricity fails. For example, it can be either wall- or pole-mounted to protect your incubator so that you can avert an accidental loss of fertile eggs and chicks, but it is also useful in keeping an eye on your farm security system like the electric fence!

Circuit Description The core component of the design given here is one revered 14-stage ripple-carry binary counter/divider and oscillator CMOS IC — CD4060BE (IC1). As shown in the schematic, components R3 and C2 set the clock frequency of IC1 close to 10 Hz, and there’s a blue indicator (LED1) to show the clock activity. The Q4 output (Pin 7) of IC1 drives an active piezo-buzzer (PZB1) and a red indicator (LED2) through a small NPN transistor S8050 (T1). The circuit also includes a standard, on-rechargeable, 6F22 9-V battery (BAT) in power supply and a low-voltage slide switch (S1) as the master power on/off switch.

The front end of the design is a simple AC230V mains presence sensor built around one popular photocoupler PC817B (OC1). The output of OC1 is routed to the “master-reset” terminal (Pin 12) of IC1 to disable its clock operation when the AC mains supply is available (standby mode). There are so many ways to convert an AC voltage into a DC voltage required by a photocoupler, and traditionally, this has been done with a step-down transformer. However, a low-cost alternative — capacitive power supply — is employed here because it’s more cost-effective and significantly smaller. In the AC mains presence sensor, a 100-n/250-V AC capacitor (C5) is the key element, and the 100-Ω resistor (R3) is to limit inrush current. The remaining components include a rectifier (D2), buffer (C4), and a protector (ZD1). The 5.1-V Zener diode (ZD1) is added intentionally to deter the blowup of C4 in case of an open-load condition at the output of the capacitive power supply (all resistors are ¼-W type).

As you might have observed, there’s a two-way jumper (JP1) in the circuit for “normal—latch” mode selection with “normal” as the default. In default mode, LED1 starts winking instantly if there’s a blackout, and PZB1 (LED2 as well) beats rhythmically (~0.6 Hz) for a short time (eight cycles). Thereafter, only LED1 remains lit until the input is reinstated. Nonetheless, LED1 and PZB1(LED2 too) wakes up instantly in “latch” mode while there’s a blackout but remains steady until the input is reinstated (watch my quick test video).

Construction Note A flake of perforated circuit board is enough for construction of the entire electronics. Remember to not only make it fit perfectly in a prototype enclosure but to isolate the high-voltage and low-voltage areas in the circuit board well with a fairly large headroom. The finished circuit board must be mounted in such a way that it’s not in direct contact with the enclosure even if the enclosure is a hard-plastic (ABS) type (plastic standoffs will be helpful). This is the enclosure model for reference — see below:

It’s also possible to connect a weatherproof external siren to the system by any two-core low-voltage cable. This allows the alert sounder to be installed outside the location being monitored to increase the effectiveness of sound travel. Fortunately, low-voltage/low-current–type electric hooters (~120 dB) are now easily available through many online sellers (the prototype was tested with an old 9-V/88-dB PCB-mount buzzer).

The term decibel (dB) and the dB scale are used worldwide for the measurement of sound levels. It is very important to realize that the term “dB” can have different meanings and the value depends on the context in which it’s used. Here is an example (only for reference) of different sound intensities as expressed in decibels hearing level (dB HL):

0 dB: Softest sound we can hear 60 dB: Ordinary conversation 120 dB: Rock band

Finally, two random shots of the muddy prototype, from my workbench!

Note: This circuit deals with high voltage, AC circuits. If you are not experienced in working with these circuits, please understand that they can cause bodily harm in the case of mishandling or not following proper safety practices.&n- bsp; Please do not attempt to manufacture this circuit unless you have taken the proper safety precautions.

https://www.electroschematics.com/mains-power-failure-alert-circuit/

It's often necessary to power a low voltage circuit such as a microcontroller with HV AC line current. For example, most fire alarms are powered this way. In these situations, a transformer is both bulky and expensive especially if the device is a consumer product. The solution is to use a reactance to limit the current, rectify the voltage with a diode, regulate the voltage with a zener, and use a large electrolytic capacitor to filter out the ripples.

The main disadvantage of transformerless supplies is that they don't offer isolation from the HV line and present more of a safety issue.

We present four circuits which use this principle and a calculator which determines the power capability for the circuit. These circuits are based on the www.microchip.com App Note AN954.See the application note for the equations upon which the calculator is based.

Supply Type Pros and Cons

Capacitive Higher cost than resistive, more efficient than resistive. The zero crossing is delayed. Resistive Lowest cost, least efficient. The zero crossing is not delayed. Bridge Highest cost, but highest current capacity and efficiency. The output voltage isn't referenced to line or neutral so TRIAC control isn't possible.

[opendirectories]

[commodorez]

A series of components that were featured in Windell Oskay and Eric Schlaepfer's book, Open Circuits. I highly recommend checking out that book.

[aneverydaything]

Day 2211, 12 July 2024

Elantica 'The Boulder' is a sculpture by Tom & Lien Dekyvere. It is made from old circuit boards. It can be found sandwiched between buildings outside the Elizabeth Line station in Canary Wharf, London

[webdiggerxxx]

ೃ༄ੈ✩‧₊˚

[magnificent-mechanism99]

Why does digital elecronics is important for engineering?

Digital electronics is super important in engineering for a bunch of reasons—it's pretty much the backbone of modern technology. Digital electronics powers everything from smartphones and computers to cars and medical devices. Engineers across disciplines need to understand it to design, troubleshoot, or innovate with modern systems.

GET CIRCUIT DESIGNING VIDEO TUTORIAL 👈.

Digital tech allows for very large-scale integration (VLSI), meaning engineers can cram millions of logic gates into a single chip (like microprocessors or memory). It enables powerful, compact, and cost-effective designs.

[mothcpu]

work doodles

[richter-ursidae]

more 8:11 pictures on a displayyyyy

tiny update.

if you look closely, in the previous post with the display the picture was rendered a little crookedly and it felt like there was not 1 image, but 2. it annoyed me, and i first looked into the code, and then into the program itself that sent the picture to the board. the solution turned out to be completely different - i just needed to save the bitmap file normally, and not anyhow. i did it with paint, so now everything is fine.

oh, and one more thing. this time i used nano instead of uno, although it seems to me there is no special fundamental difference - the pinout is the same.

[shepscapades]

YOU.

UMMMMMM

[hold-fast-and-rise]

[noosphe-re]

Researchers propose source mask optimization technique in computational lithography, by Zhang Nannan, Chinese Academy of Sciences

[tracfone]

Hope you all left milk and cookies out for glabdos portal for pride month

[bisexual-engineer-guy]

engineer something please

I'm actually really proud of this. Three months ago I didn't know anything about electronics, and today I finished up my first home brew radio. Works on the 80m ham band. The switches let you change between AM and CW. It works with a microphone as well. Don't ask what the 741 op amp does, cause I really couldn't tell you, but somehow that makes the 386 work so I can't complain. Anyway. Yeah. Low power but works splendidly. The waveform is also incredibly clean. Took me a few days to get to this point but I'm really really really happy with it!