Questions tagged [hobbyist]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2
votes
2answers
1k views

Is it safe to over-volt brushless out-runner dc motor on low load conditions?

I have a 1100KV brushless DC motor (turnigy d3548/4) rated maximum voltage 19V i want to run it at 25V assuming low load as i mostly need the higher rpm ! whats are the effects of this higher ...
0
votes
1answer
295 views

How to wire the mains to a transformer for end user safety?

Because this can be deadly, and is best left to someone qualified; advice for hobbyist projects on the web are reluctant to offer advice on safely handling mains connections. The get-around is to ...
1
vote
2answers
78 views

What is the term for a photo sensor that takes low-resolution, black-and white, closeup images?

For work I used to have to read and log 7-segment LCD numbers off this tiny (3cm x 1cm) screen tens of times per day. Now I have a webcam setup that reads it for me and does some OCR to automatically ...
0
votes
1answer
66 views

Solar powered 5W DC12V pump

I'm trying to power a little pump (http://www.amazon.com/gp/product/B00JWJIC0K) with a solar panel I have. I've stepped the voltage out of the panel down to 12V with a buck converter. The panel is ...
0
votes
1answer
243 views

Is this a limit switch design? What switches needed for this project?

I wish comments on how to best achieve a design involving two limit switches on a DC motor, but which does not reverse the motor. I've researched this design already on this forum; here's my work, I ...
17
votes
4answers
3k views

What well-known ICs have essentially no packaging?

As a kid I once found a calculator whose IC was protected only by a loose plastic cover. With the cover removed, and with appropriate lighting, I could make out distinct features of the IC– including ...
0
votes
1answer
362 views

Current Source version of TLC5940 (current sink LED PWM driver)?

Is there a current-source equivalent of a TLC5940 (current-sink) PWM LED driver? I'm working with a large number of linear resonant actuators (LRAs), each of which only uses ~50mA, but must be driven ...
5
votes
6answers
2k views

Would it be possible to make a solid state transistor by hand?

I am curious, would it be possible to fabricate a modern BJT/FET transistor with hobby/garage tools only if size and aesthetics was not important? Which materials would one use and how would one ...
1
vote
2answers
341 views

Checking my understanding of how hobby servo motors operate?

Can someone tell me if my understanding is correct please. The control signal to a hobby servo motor that is connected to an arduino operates by : In every 1 s there are fifty windows each of length ...
-4
votes
1answer
89 views

how can i using CPU8085 and PIO8155 crate an alarm circuit and program [closed]

example ; we have smoke sensor, speaker and my circuit.When Sensor has been active, speaker to sing it. i'm newbie in this topic. how can i do it like this circuit ?
2
votes
4answers
4k views

Mounting a PCB with velcro

I need a lo-fi way of mounting a PCB (Tessel plus RFID card) under a table. The easiest method by far would be velcro but I'm worried about static discharge frying my circuitry. Should I be?
4
votes
3answers
2k views

Is electronics an expensive hobby? [closed]

I recently just finished my Eagle schematic for a simple robot that moves and plan to order the parts and the PCB soon. Unfortunately with the soldering iron, helping hands, lights, solder, parts, and ...
2
votes
2answers
677 views

3 LEDs / 1 POT - fade each LED in turn as POT is changed in value ?

I'm looking for a simple (hopefully !) circuit which would allow a variable resistor to control the brightness of three different coloured LED's. As the variable resesistance is changed in value first ...
3
votes
4answers
719 views

Is there any way to use industrial sized IC's package in home project?

All actuals DSP or MCUs comes in BGA-like packages with numerous pins and very small size that make them hard to integrate in home project. Does anyone has knowledge of revolutionary breadboards, ...
0
votes
2answers
110 views

Help with wiring of stereo jack

Could someone point me in the right direction. What I'm doing here is I took the insides from a cheap Bluetooth speaker and I would like to rewire it to an headphone jack (male). I have the cable ...
2
votes
3answers
4k views

Powering 28 LEDs in series by 220VAC - simple stabilizer

I have a home-made thingy that I would like to use as a lightning in my living room. It contains 7*4=28 LEDs (red, 1.86V, ...
1
vote
5answers
573 views

How to cheaply switch between two sets of 7-input-wires?

I am trying to make a water level sensor. I want to use a single circuit for two water tanks. For this I need to be able to switch between two sets of 7-wire-inputs to the circuit (the 7 wires that ...
1
vote
2answers
3k views

How can I create a theatrical spark ejector?

I'm involved with an amateur theatre company (I do lighting, audio etc...) and would like to simulate a switch short-circuiting. I have also done a bit of magic in my time and have used "spark ...
34
votes
4answers
28k views

Building a hobbyist oscilloscope

I have a project that I've been thinking about for a little while, and I've come to the realization that at some point during its development, I'm going to need an oscilloscope. Okay, not a problem. ...
2
votes
2answers
2k views

Using an Arduino to Emulate a CD4021 Shift Register for Controlling an NES [duplicate]

This is probably a silly thing to do when I could wait for my CD4021s (74HC165Ns) to arrive and save myself the hassle but I feel as though this can be done and I'm simply missing something. I've ...
0
votes
1answer
246 views

Should I use Mathematica to understand circuit behavior? [closed]

I've just started learning about circuits from the "Foundations of Analog and Digital Electronic Circuits" book. KCL, KVL, element laws and linear circuits were easy to grasp but then I got the half-...
1
vote
2answers
7k views

Trigger a relay with a very low DC voltage

I want to light up a couple of LEDs using a relay to trigger this event. I have a very low DC voltage, about 0.15mV to 0.20mV and I want to somehow take this voltage to a relay, that will be also ...
7
votes
4answers
2k views

Ideal location to practice soldering

Sounds like a stupid question, but really hasn't been asked before, or I haven't found a post about it. Either way, here it is: I bought a soldering iron recently and am looking for a place in my ...
6
votes
2answers
2k views

What are the characteristics of a memristor?

This is an in-spirit follow-up to my earlier question. So I'm an electronics hobbyist, and I've been curious for a while about the proposed new component, the memristor. My research has turned up ...
8
votes
5answers
3k views

Does it make sense to measure components in-circuit in order to prove non-functioning?

When an electrical circuit is not working properly does it make sense to use a multimeter to measure/test the individual components in-circuit (without soldering them out), e.g. measure transistor ...
5
votes
6answers
15k views

How to hand drill PCBs?

Drilling 300 holes in fibre board is tedious, difficult to do neatly and prone to snap bits. What simple methods and tools are available to the home user to drill PCBs effectively? In my case it's ...

1
2