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Questions tagged [breadboard]

A breadboard is a pre-made generic board for prototyping, typically referring to solder-less, reusable plugboards.

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MB-102 source for breadboard [closed]

Recently i bought a breadboard with MB-102 source (pic. below) Like 2 days everything worked as a charm, but yesterday the both voltage regulators stopped providing 3.3V and 5V. Now they are ...
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60 views

LM386 and strange way of curbing noise

I am using an LM386 to drive a cheap 1-2 inch 8-ohm speaker. The input to the LM386 is an output from a DAC, which is outputting a sine wave between 100-1kHz, so I don't need any frequencies above ~...
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1answer
49 views

Power issues on TTL circuit

I am building a homebrew 8-bit computer on breadoards and PCBs with TTL logic IC's (LS, HCT and ALS families). This is a small portion of the circuit (3 modules): I'm using an ordinary phone charger ...
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1answer
26 views

Unable to supply FONA 32u4 3.5 v through circuit

I am relatively inexperienced when it comes to circuitry and electronics. However I am trying to create a simple device in which with a press of a button, the device turns on and calls a specific ...
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2answers
70 views

741 Op. Amp.: Inverting input connected to output (pin 2 connected to pin 6). What does it mean?

simulate this circuit – Schematic created using CircuitLab I am a newbie electronics students. My question is, what does it mean (what happens) when you connect pin 2 to pin 6 on a 741 op. ...
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1answer
102 views

Zero crossing detection circuit correct?

I am working on a DIY AC dimmer circuit with arduino. This project is part of the AC dimmer circuit as mentioned here Since, I was stuck in so thought of retracing my steps and checking each part of ...
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4answers
2k views

AND Gate Stays Open

I have a very simple circuit on a breadboard with two push-button switches, an AND gate (74LS08), and an LED. I have the two switches hooked up to pins 1 and 2, while the LED goes from 3 to ground. ...
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2answers
49 views

Magnetism and my breadboard

So today I assembled a little circuit to test my new shift registers (74HC595). I took three breadboards and connected them as shown on the drawing here. It is supposed to work as a user ...
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1answer
75 views

555 Astable Timer produces incorrect period/frequency

I am building a 555 astable timer circuit for a course which must match the BPM of a song. The song has a BPM of 104, which requires a timer frequency of roughly 1.733 Hz. The circuit looks as ...
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1answer
68 views

Why doesn't my bench PSU read current on a breadboard?

I've recently purchased a cheap eBay DPS3012 DC-DC converter supply. I intend to use it on breadboard projects. The "problem" is that the meter reads a 5V output, with no current being drawn and ...
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1answer
1k views

What breadboard simulation software is this?

I'm not familiar with what software is available and cannot recognize the origin of this diagram. Does anyone know what software this is? I'm only guessing that it can perform simulation; it may just ...
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0answers
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Using 1 74LS377 instead of 2 74LS173, how do I keep the CLEAR function?

I am currently following a online project guide for an 8bit breadboard computer. https://eater.net/8bit/parts I was up to the stage of sources parts when I found it difficult to find 2 74LS173 IC's (...
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2answers
1k views

Circuit to Breadboard [duplicate]

I'm currently working on a project which requires me to test the functionality of TTL logic gates by making use of diodes and resistors. To do so I must first place them on the breadboard and then ...
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0answers
47 views

Help! NE556 PWM circuit for controlling MC-2100 DC motor driver

I built a 556-powered PWM controller as explained in pg 10 and 11 of this PDF document: https://www.dropbox.com/s/3ous60tvartqibb/Terry%27s%20Dual%20555%20MC-2100%20Driver%20Circuit.pdf?m The ...
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1answer
88 views

Noise everywhere on solderless breadboard, could the DC-DC converter be the source?

I am using a solderless bread to prototype an analog sense -> 8 bit digital circuit. It's messy Has Hi gain sensing opamps sensitive POTS I have 20mV of noise everywhere, even when I am connecting ...
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1answer
66 views

Is the grounding of the breadboard common used? [closed]

Is the ground of the breadboard common used ? I mean can i connected two different voltage producer (voltage supply) ground pins in the some negative hole in the breadboard?
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2answers
2k views

How adding a jumper switches the power between 5V and 3.3V?

Below is a snapshot of MB102 bread board powersupply that can provide either \$5V\$ or \$3.3V\$ on either rails. We can switch between 5V and 3.3V by adding a jumper as shown. I'm just wondering how ...
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2answers
125 views

Connecting Led in Series with Parallel Switches

I created a diagram for a circuit that i am trying to implement. I have attached my circuit diagram and have been trying to implement it but still have not got it to work. I've checked all the wiring ...
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3answers
63 views

Need help choosing a power supply for a breadboard [closed]

Hey i want to (in the long term) start experimenting with remaking modules from old analog synthesizers. For example remake an oscillator from a Minimoog or a chorus from a Roland Juno-60 or something ...
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3answers
4k views

What kind of rubber “melts” plastic?

I know this should probably be posted in a chemistry exchange, but I figured the parts are pretty standard electronics equipment that the question might be more relevant here. So a couple of ...
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1answer
112 views

Why don't single row circuits work on a breadboard? [duplicate]

I am fairly new to electronics, and whilst messing around with a simple LED circuit on my breadboard I noticed that when connect my resistor and LED on two separate rows, the LED lights up as it ...
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1answer
31 views

Relay circuit not working

I have connected my relay with a nodeMCU so that when I give commands to relay through nodeMCU the led connected to relay gets powered up. But after proper connection also it doesn't power up.
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2answers
60 views

How to check if a device is compatible with a breadboard?

I am just in the process of purchasing components for a control systems project but I am having trouble selecting a barrel jack that is compatible with a breadboard layout. I'm not sure if there is a ...
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1answer
77 views

Breadboard connections

I am new to breadboard electronics projects. I am looking to do this project but am a bit lost on what all I need parts wise. This is my current parts list: ...
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1answer
71 views

How to hook up a fan to this switching circuit

I am trying to build a controlable fan with a raspberry pi and I have found the below circuit for a switching circuit to allow the 12V power to go to the fan My question is how do I then hook the fan ...
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2answers
119 views

Jumper wire solution for short header pins /

I installed header pins that fit into a feather microcontroller, but since they are not double sided header pins, the top side is too short to attach normal jumper wires to. Is there some clean, non-...
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2answers
66 views

ADC readings problem: built in vs external ADC unit

Why am I getting these (mostly) good readings with the built in ADC of the Arduino Uno (10 bits resolution): and these scattered values (same analog sensor used) with the external LTC1418 ADC (14 ...
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2answers
212 views

Common Mistakes Using Breadboard: What's Wrong? [closed]

I didn't wire my circuit correctly and burnt out all my LEDs. I put the resistor's nodes in the same 5 hole row and put each terminal of LED in separate rows. The LED lit up, but soon after blew up. ...
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1answer
99 views

Photo resistor night light not working

I am completely new to this stack exchange and to electronics and general so please keep that in mind if my question is not up to par for this site. I've attempted to make a night light using a ...
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1answer
85 views

How to build a circuit in a breadboard? [closed]

Basically, I want to build the following circuit on my breadboard to compare my analytical and my experimental results. The power source is going to be a signal generator. How can I set this up? I am ...
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2answers
54 views

Switches implementation Help [closed]

I am an aspiring student taking a robotics course. I currently have a problem about a circuit I am currently making. This circuit looks very similar to this one here: Falstad actual circuit: http:/...
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1answer
67 views

PIC16F84A wont run my program on a breadboard

I have written a program on the PIC16F84A and it seems to work perfectly on the PIC testing board. After i had created the program and assembled it onto the PIC, i placed it onto the breadboard and ...
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1answer
104 views

Can I program a Breadboard with a laptop? [closed]

I want to be able to program a breadboard with a laptop, male to male usb cord, powersupply circuit board (which has a usb in port) and breadbord. My question is, Will this setup work?? Basically ...
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Need help with project setup

I am working on a project for a class called EDD. I am trying to create a solar powered backpack. Basically, it will take solar energy and transfer it into a battery pack that has a micro-usb input. I ...
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1answer
116 views

Resistor vs wire in Arduino, breadboard

I was trying out different tutorials with an Arduino/LED. I was following this tutorial when I ran into a problem. I tried two configurations of the wires: one from the tutorial with a wire ...
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1answer
60 views

Losing power when using breadboard with Raspberry Pi 3

I am controller a DC motor with Raspberry 3 via a breadboard. It works very well. The aim is to open and close a door of a chicken coop. My issue is that the motor does not have enough power. If I ...
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2answers
72 views

Power in circuit fading away after a few seconds

I have an RGB LED strip connected to a power source via a breadboard with three MOSFETs that are controlled by a Raspberry Pi. I followed this tutorial to build exactly this setup: This worked before,...
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0answers
48 views

Looking for an adapter to be able to work with small size IC chips on a breadboard [duplicate]

Is there any adapter that help me to mounting small size IC (like the image below) on a breadboard? What is the name of this size or form factor?
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1answer
237 views

Power MB102 from a USB port in the computer

Just bought a MCU ESP-01 which requires maximum 3.3V and uses at peak 200mA. So to power my projects, I also acquired a breadboard power supply (MB102) which can output 5V and 3.3V simultaneously. It'...
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5answers
942 views

Powering Multiple LED Strips

I'm new to EE in general and I've gotten myself a bit confused. My apologies if this is a stupid question, but my research isn't helping too much. I am working on a project to control 7 LED strips ...
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0answers
169 views

Interference from fluorescent lamp on TTL breadboard circuit

I'm trying to make a Homebrew CPU on a breadboard with TTL chips. The approach is to make small modules and to test them isolated from the others. Everything was ok until now. The Registers Module ...
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1answer
329 views

Clock input of a D Flip Flop

I am a beginner at digital electronics and I am supposed to create a circuit on a breadboard using some kind of a flip-flop. I designed the circuit and decided to use a D- Flip flop since I only have ...
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6answers
4k views

Why does this comparator not output a square wave?

I have a 4.43MHz sinusoidal output from an IC that I want to convert to a TTL square wave to use as a clock. The signal has a DC offset of around 2.5V and has an amplitude of about 0.5V peak to peak. ...
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3answers
5k views

I painted myself in a corner. How to layout?

I'm a hobbyist working mostly in DC projects. For development and testing, I use breadboards, and later a perforated board. My projects are normally low count: an Arduino Nano/Pro Mini + a few ICs. ...
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2answers
671 views

Dual Power Supply (Two 9V)

I am Not Good At This, and I am trying to breadboard this circuit here: http://www.instructables.com/id/DIY-EEG-and-ECG-Circuit/ But I am stuck on the power supply. The instructions state: ...
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1answer
213 views

DC motor voltage divider with NPN, diode, capacitor, and separate battery

I am trying to hook up a 9V battery to a 6V DC motor on a breadboard. The circuit on the breadboard has a 5V supply. Is the attached schematic correct in applying a 2/3 voltage drop from the battery ...
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1answer
49 views

No output from 556 timer

I've attempted to set up a 556 timer on a breadboard. I bought two 556 timers because the project I will be using it in requires 3 timers, and I wanted to be cost effective. I have followed a ...
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0answers
199 views

TRRS 3.5 mm Audio Plug (male) into a printed circuit board

Have a device I'd like to plug into a headphone jack of a cell phone. Wanted to start making some more professional prototypes; print my first circuit boards, etc. I'd like to be able to implement a ...
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1answer
94 views

Electronic hobbyist project-short circuit detector

I am doing this circuit which I took from from the internet for my project. I have 3 questions: The circuit show glow 2 leds one if there is a short circuit if there is one in J1 and the other if ...
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3answers
635 views

RJ45 connector on breadboard

For my project which for the next (many) months I want to make it on a breadboard. I ordered RJ45 connectors, but these do not fit on a breadboard. What would be a good way (or is there a way) to ...