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Why does my register file operate abnormally?
I tried to implement a 32x32 bit register file using Logisim. Once I have finished drawing and proceed to test it by initializing the content of individual registers to zero using the reset input, only...
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Need help in finding short circuit
I designed a basic power amplifier powered by +12V/-12V. During the breadboard testing phase, the bench power supply indicated a stable voltage of +12V/-12V and a current draw of 150mA. After receiving...
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Thévenin's theorem for voltage divider bias
I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied Thévenin's theorem and converted V1 and R1, R2 into Vth and Rth as shown in the image.Vth = V1 x (R2 /...
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How can I modify this cheap power supply for constant current output?
I bought a 12V, 2A PSU for 1$ and it has the common design with CSC7203 IC:The one I got didn't have the input fuse, capacitor, TVS diode and the output filter inductor. I added all those myself. also...
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Gate switching - Guitar signal gate controlled by another signal
The circuit below is based on a noise gate and a JFET based switching circuits. The idea is to mute the guitar signal when another signal pases certain threshold of volume (like a reversed gate...
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Zener diode on NRST pin of STM32
I am using STM32L476QGI6 in my project. As shown in the following figure, I have placed a 3.6 V Zener diode (ZM4729A-GS08) on the NRST pin of my microcontroller.The problem is that when I connect the...
View ArticleConverting Old Beer Sign Fluorescent To LED - Question On Switch Wiring
I am converting a 1962 beer sign with a 9" t5 fluorescent bulb to an LED bulb.It has power cord with an inline ballast (I believe it has an internal starter). Two wires in from 2 prong plug, three...
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Understanding a Class D amplifier design
I've been trying to build a simple class D amplifier. I've seen through the block diagrams and design considerations online, but recently came across an amplifier design which doesn't seems to fit the...
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How to vary the voltage output depending on the changes in temperature?
I am working with the Siemens Logo8! PLC (0BA8 version) and the purpose of my circuit seems to be simple:If temp > 25°C then output voltage = 8VIf temp < 25°C and >15°C then output voltage =...
View ArticleCircuit for auto power off
I am looking for a circuit that can power off automatically after some time (i.e., ten minutes, but accuracy is not important here).When the circuit cuts the power, the power consumption should be as...
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How to limit current for this LED in circuit with a load?
I'm a newbie in electronics and just recently decided to get some deeper knowledge and try to start some projects. But it didn't take that long before I became stuck. Here's my problem.I want to design...
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Low-side short-circuit protection
I have a circuit board that, among many things, drives a few 24 VDC relays on another board located 5-10 feet away.Everything usually works just fine, but I recently had an incident where the relay +/-...
View ArticleCalculating/choosing the right capacitor
For designing a pyrofuse driver, I need to add a capacitor that serves as an alternative power source in case of main power supply cut-off. The driver has a configurable firing pulse of 1.2A/2ms or...
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Capacitors in my amplifier circuit [closed]
I made an amplifier circuit. It has a 10393 voltage gain and a 557345 current gain, but in reality it doesn't make much noise. Can you please help me? Vdc is 18 V.
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Smoke stopper circuit
I've built a smoke stopper circuit that I want to use once my first quadcopter will be built. It's basically a simple circuit that sits between the LiPo battery and the drone, that lights a lamp if a...
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I would like to know what type of op-amp this circuit is
This circuit is connected to 250V AC power and I would like to calculate the values of the resistor and capacitor, but I don't know which formula to use to calculate it.I think this circuit is...
View ArticleSimple TTL: Is there a way to "detect" a high-z state and easily use that to...
I have two TTL style logic chips, call them A and B (*), where the outputs of A are the inputs to B (think: 8 data lines). A has tri-state outputs, so when they are turned off they float. B is an...
View ArticleMicrophone signal backflow prevention [closed]
I am working on a bit of a unique project. I am making a push to talk device that will be used with a Ham radio and a phone. The push to talk will be connected to a headset with ear speakers and a...
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How to understand MAX25431 datasheet on inductor selection?
I am trying to design a project featuring MAX25431 buck-boost converter.After examining the datasheet I started the part selection for my application, but I have troubles understanding few details:In...
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Is this relay circuit valid?
This is my current circuit draftWhich had the SPST-NO symbol adapted from the supplier's symbolI have not chosen any specific parts for diode, resistor or transistor.ALDP105W Relay datasheet: hereI am...
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