Electronics Design

My partner discovered that we had to clean the pads with alcohol first, so I used it on three remotes. Apply a thin application and wait 1 hour for it to dry. I tried, but it was impossible. So, can someone show me the best way to get paint to stick on silicone pads using electric paint? Thank you in advance!

I have decided to replace my 12V halogen bulb downlighters as some have started to fail. Just the bulb has failed which leaves me with the electronic transformers. Typically they are 230V to 12V but at 40+kHz, so assumed pulse width modulated, especially as suitable for dimming. Has anyone found an alternative use for these? I must say the replacement warm white LED downlighters I have replaced them with are much better in my opinion even without the efficiency and (hopefully!) long operating life specified. Just a shame to have to recycle the working halogen transformers!

Hi everyone! To design someting, we could direct modeling with DesignSpark Mechanical, right? But I would like to know more details about designing 3D models because I just had the stimulation model popped up in mind, I hardly create anything with basic knowledge tho.Can someone please give mea piece of advice or guidelines? Thank you so much!!!

Hello!   I want to make something that uses PWM pulses to control the closing of an electronic switch. And from the information, is it more appropriate for this to use the lm2903 comparator? Good listening!

Hi, thank you for ur reading first! I want to design a DC/DC circuit, which is to reduce 12V to 5V. I searched for it on wiki and others, even saw an article introduce it in detail. But I can not find the relatives about the principle of its step-down. So I am still confused. Can you tell me about the principle of the LM2596S-5.0 Voltage Regulator's step-down? Thanks in advance!

Hello All, Electronic product compliance is a topic that has baffled me for years. I have spoken to seasoned engineers and reputable test houses, but I have yet to get a definitive answer regarding when it is acceptable to conduct self-certification on electronic products you intend to sell. The requirements for CE directives like EMC seem especially vague and while test houses are more knowledgeable, they are obviously unlikely to suggest anything that does not involve their services in some capacity which ultimately affects the feasibility of small-scale electronics manufacture. I have heard that observing best-practices and conducting due-diligence may be enough for the vast majority of low-risk products, so would it be sufficient enough to do this for something simple like a flashlight, and then place a CE sticker on the box? I’ve also noticed you can even buy products that actively state they are not CE marked! It’s clear as mud, so I thought it would be interesting to hear the experiences of anyone who has successfully navigated this process and their policies regarding CE marking, self-certification and when you would actually need certified testing?

I have worked many years ago on high performance motor servo amplifiers, however now I'm looking for something a little more, well let's say "basic"! As part of my journey into the arts, I'm now learning the basics of pottery and need a potter's wheel to get some practice. Good ones are too expensive for me and cheap ones are reported as very poor and underpowered. So having a good powerful servo motor saved for over 40 years for the right project it's time to bring the beast to life!My question is has anyone built or used the simple current sense/back emf compensated PM DC motor speed control method and any comments on its performance? For a potter's wheel, it should slow slightly on load (so not a perfect speed controller) and the potter adjusts the speed by a foot pedal to the desired speed. As the slight slowing down under increasing load is the main issue raised against this method, it sounds ideal!

Hi, I'm doing kind a project and I've got to supply my PCB circuit with 5V DC with the input of 230V AC. So I need a transformer but I don't know which one should I take and where can I get it. The devices I will connect to the PCB consume like 70W. Some help pls. Thanks.

I have recently completed a project designing a tuneable coupler and am working with semiconductors over the next few months. What does the community think is the best resource for learning HF/RF materials? 

    I am intending to fit lights to a 1/32 scale model slot car. This is for a Le Mans type race where part will be in darkness.Power supply will be between 12 -14v DC.I would like to fit a capacitor into the circuit to keep the lights on for a short period, say 10 seconds, if the car comes off the track.I have some small 12v rated LED lights.I have done a little research and think I need a 1000 micro farad capacitor, across the LED wires with a diode on the positive side, and a 470ohm resistor on the positive wire. This is based on the attached wiring diagram (from the internet).   Can anyone advise on the type/rating/size of each of these components?   If from RS Components, can anyone help with the part number. I tried asking direct but they needed all sorts of specifications that I had no idea about.   My knowledge is very very basic!

I want to design a automatic water depositor, water entering in a single pipe and deposited in multiple pipes, each output pipes are individually controlled by solenoid and ultrasonic sensor . How can I design a system like this?

Hi, I am working on an electroncis project where need to control DC motors and I need to control speed & direction, I am using IGBT for that. But I have read online that I need to use optocoupler after microcontroller's pins. I have found PC817 optocoupler online and it looks nice. So, should I use this one or can anyone suggest me a good one? and so I have to use it ? Thanks.

STEAMPUNK/Retromodern/Hybrid Radios     Grammarly Hi  Looking for comment; advice; assistance; for my Senior Citizens SWL/Scanner/DXing Club' STEAMPUNK/Retromodern/Hybrid Rado Receiver/Objet d'art/Plural Objets d'art Project(s)    A) To Retrofit/Restore, Antique/Vintage TRF & Regenerative Receivers to use a low, safe, Plate voltages.  B) To Build, Breadboard style, Crystal, TRF and Regenerative Radios using Antique/Vintage Tuning Components with modern electronics to come up with Objets d'art Sculptures; as well as Functional Radios.   Steampunk combining Antique Components with Modern Electronics  The basic idea is to give the user the "feel " of 1920's multiple Tuning Controls with modern stable electronics.   The need for assistance is coming up with simple basic RF Amplifier schematics.  Tubes and/or Transistors especially circuit designs using 12 volt Space Charge Tubes.  Plan A: All solid State Plan B: All Hollow State Plan C: Hybrid is Hollow State RF with Solid State Detectors and Audio Amplifiers. For Antique/Vintage Radios the plan is to remove all high voltage Tubes and use the Hardware Chassis Tuning Components and wiring and use RF & Audio Modules/PC Boards; Hollow State and/or Solid State; mounted on dead tube bases. Minimal disruption to original circuitry so as to be able to reverse changes to allow a conventional restoration. Hybrid comes in with Hollow State for the RF Stages and Solid State Transistor/semiconductor pcboard/modules for Detector and Audio; readily available on eBay. The need for assistance is coming up with simple basic RF Amplifier schematics to build PC Board/Modules Tubes and/or Transistors as well as circuit designs using low plate voltage Tubes.  thanx  73 de jordan ve7jjd   jjdobrikin@gmail.com     

Hi There, I am hoping some one may be able to offer me an effectuve solution to a project i am working on. We are creating some printed 'Point of sale' (POS) for a clinet of ours and they want a motions sensor that activates a noise inside.  I am curious if anyone would know of any solution? We are looking for 2560 items. Many Thanks, Tomos

Hi there,I am new to all this electrical circuit stuff so any help which much appreciated.https://forum.allaboutcircuits.com/threads/temperature-control-system-band-heater.176196/ I have designed an electrical circuit for the control of a band heater used to heat a pipe (see link). The system consists of two parallel systems both have a 3-prong rocker switch, a PID controller, thermal couple and a band heater.If anyone could give me some advice/corrections into whether the wiring I have proposed is correct, again this would be much appreciated.