Circuits and Projects - eTechnophiles Forum https://forum.etechnophiles.com/basic-electronics-circuits-projects/ Hi, Welcome to the eTechnophiles forum. Got a question like, \'What resistor value to choose for your simple LED project\' OR \'Where is the resistor connected to the inbuilt LED in Arduino UNO\'s schematic\' - All will be answered here. Feel free to check out the topics below. en-US Sun, 12 Apr 2026 14:27:39 +0000 wpForo 60 Why are there two separate registers in 74HC595? https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-are-there-two-separate-registers-in-74hc595/ Thu, 03 Jul 2025 12:24:21 +0000 Hi,
I was trying to understand the working of the 74HC595 Shift register, so I opened its datasheet.
It has two registers(one called shift and the other one storage). But I am confused.. why do you need an extra storage register? What's the purpose of the register? How these two registers are working together to shift the O/P?

]]> Circuits and Projects Rahav https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-are-there-two-separate-registers-in-74hc595/ new to electronics and needing some guidance with a circuit . 555 LED lights https://forum.etechnophiles.com/basic-electronics-circuits-projects/new-to-electronics-and-needing-some-guidance-with-a-circuit-555-led-lights/ Thu, 03 Jul 2025 10:26:23 +0000 Hi all 

New here ...so please bear with, as I find the ropes ,   First let me explain.  Quite a bit on the distant side of yoof.  Am a mechanical engineer who has spent considerable time playing with motorcycles,   So im familiar with the " basics",   Now that computers and such simulation software has become more available ,,,I decided to "upgrade", and have been playing with circuits.  However, I think Im into this a bit deep,     I modelled a LED lighting circuit using tinkercad,  things flashed ... but didnt work,   Then I noticed there were many "similar circuits " on line....   Heres, the question;    Are these "ai generated circuits?"     are the "use-able?  and if so what am I doing wrong,,, are these value for the components valid?    Ive never used a 555 chip before and while I understand how it works ,,,ive never actually used on,,,    Thank you in advance ,,,any help is gratefully received 

Kind regards 

Stephen

]]> Circuits and Projects basilwatson https://forum.etechnophiles.com/basic-electronics-circuits-projects/new-to-electronics-and-needing-some-guidance-with-a-circuit-555-led-lights/ What connector do I need? https://forum.etechnophiles.com/basic-electronics-circuits-projects/what-connector-do-i-need/ Tue, 17 Dec 2024 23:15:03 +0000 How can I tell what the specs are on this connector so I can replace it?  I need both the male and female sides. Do any of the numbers around the connector tell what it is?
It connects the PCB to a AAA battery compartment.  Forgot that the batteries were left in and they caused corrosion. 

Also, what is the best way to clean up  the PWB?

Thanks

]]> Circuits and Projects GPag https://forum.etechnophiles.com/basic-electronics-circuits-projects/what-connector-do-i-need/ Why are resistors in parallel preferred over a single resistor in some circuits? https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-are-resistors-in-parallel-preferred-over-a-single-resistor-in-some-circuits/ Tue, 17 Dec 2024 06:00:48 +0000 In certain circuits, I have noticed that multiple resistors are connected in parallel instead of using a single resistor with the desired resistance value.

What are the advantages of using resistors in parallel over a single resistor? Are there specific scenarios or benefits, such as power handling or availability of components, that make this approach preferable?

I would appreciate any insights or examples where this technique is commonly applied.

]]> Circuits and Projects Bryan https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-are-resistors-in-parallel-preferred-over-a-single-resistor-in-some-circuits/ Need help with Power Supply for 12V 4watt Motor https://forum.etechnophiles.com/basic-electronics-circuits-projects/need-help-with-power-supply-for-12v-4watt-motor/ Wed, 04 Dec 2024 20:27:22 +0000 Hi there, I am a total noob with electronics so figured I'd ask here for some help. I just bought a synchronous motor and need to power it. The motor is 12 volt AC 4 watt 50Hz. Can someone point me to what outlet and inverter (if necessary) is needed to power this motor, whether it be an outlet or battery powered? Here is a link to the motor I am using.

Thank you for any help you can provide!

]]> Circuits and Projects getta https://forum.etechnophiles.com/basic-electronics-circuits-projects/need-help-with-power-supply-for-12v-4watt-motor/ Suggestions for Good ATtiny85 Projects https://forum.etechnophiles.com/basic-electronics-circuits-projects/suggestions-for-good-attiny85-projects/ Mon, 28 Oct 2024 04:54:00 +0000 Hi everyone,

I just bought a new ATtiny85 microcontroller, and I’m excited to create some projects with it! Since it’s my first time working with the ATtiny85, I’d love to hear your recommendations for fun or practical projects.


]]> Circuits and Projects tricky_logic https://forum.etechnophiles.com/basic-electronics-circuits-projects/suggestions-for-good-attiny85-projects/ Why Use a DC Motor Controller Instead of a Potentiometer? https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-use-a-dc-motor-controller-instead-of-a-potentiometer/ Tue, 30 Jul 2024 05:41:08 +0000 Hi everyone,

I'm currently working on a project that involves controlling the speed of a DC motor. I understand that a potentiometer can be used to control the speed of a motor by varying the resistance, which in turn adjusts the voltage supplied to the motor.

Given this, I'm curious about the need for dedicated DC motor controllers. Why should I consider using a separate motor controller when a simple potentiometer seems to achieve the same result?

I'd appreciate it if someone could explain the advantages or scenarios where a DC motor controller is preferred over a potentiometer for speed control.

thank you

]]> Circuits and Projects hobart bess https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-use-a-dc-motor-controller-instead-of-a-potentiometer/ Why do some DC motors come with a capacitor across them while others do not? https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-do-some-dc-motors-come-with-a-capacitor-across-them-while-others-do-not/ Sat, 25 May 2024 04:58:36 +0000 Hey guys,

I have purchased a lot of DC motors from different sources recently. Some of them have capacitors soldered across them, while some do not. Why is this so?

]]> Circuits and Projects TechSpark https://forum.etechnophiles.com/basic-electronics-circuits-projects/why-do-some-dc-motors-come-with-a-capacitor-across-them-while-others-do-not/ Need help with the working of this circuit https://forum.etechnophiles.com/basic-electronics-circuits-projects/need-help-with-the-working-of-this-circuit/ Fri, 03 May 2024 08:17:22 +0000 Hello everyone,

I found this circuit in the "100 transistor circuits" ebook. Can somebody explain the working? 

Thank you

]]> Circuits and Projects nathan https://forum.etechnophiles.com/basic-electronics-circuits-projects/need-help-with-the-working-of-this-circuit/