Hobby Electronics Basics

PIR motion detector circuit

I wanted to try this next, but wanted to know if it looks like it has a good chance of working. https://circuitdigest.co...

6 comments posted 7yrs

posted by scientist77017

6 comments posted 7yrs posted by scientist77017

Removing solder

I use my desolder gun to remove solder from circuit boards but I can't always remove enough especially when the solder i...

10 comments posted 7yrs

posted by scientist77017

10 comments posted 7yrs posted by scientist77017

What determines a low leakage capacitor?

I am trying to find info about what a low leakage capacitor is. I read that aluminum electrolytic caps have a higher le...

20 comments posted 7yrs

posted by scientist77017

20 comments posted 7yrs posted by scientist77017

From breadboard to soldering

I am ready to transfer my circuit from breadboard to PCB Prototype Circuit Solder BREADBOARD. Any advice appreciated. I...

45 comments posted 7yrs

posted by scientist77017

45 comments posted 7yrs posted by scientist77017

Frustration

Electronic can be quite frustrating. I put together a circuit for a laser alarm. It does not work. There is no way to t...

63 comments posted 7yrs

posted by scientist77017

63 comments posted 7yrs posted by scientist77017

Resistance Light and Dark Values

What specifically do these terms mean for a LDR? Resistance (Dark): 1M? Resistance (Light): 12k?

27 comments posted 7yrs

posted by scientist77017

27 comments posted 7yrs posted by scientist77017

Dark silver wire

Some of the wire i strip and solder is a dark silver color. Its a pain to solder to copper.. Is it aluminum? I read that...

8 comments posted 7yrs

posted by andrewkennedy775

8 comments posted 7yrs posted by andrewkennedy775

Soldering 18650 batteries

I was thinking of replacing the 18650s in my Dewalt battery when they go bad. When using tab wire, what temp do I set m...

7 comments posted 7yrs

posted by scientist77017

7 comments posted 7yrs posted by scientist77017

Crazy idea?

Mebbe I shud jest leave things be... But here goes my crazy idea. I have a Ford 9N tractor. The hydraulics that raise t...

2 comments posted 7yrs

posted by etpm

2 comments posted 7yrs posted by etpm

Probe tips

I want to put something on the end of my multimeter leads so I can clip them on what I am measuring. On another meter,...

4 comments posted 7yrs

posted by scientist77017

4 comments posted 7yrs posted by scientist77017

Resistance question

I have read the manual for my Excel multimeter. But it is not clear about resistance measurements. I got 24.6 on the 200...

16 comments posted 7yrs

posted by scientist77017

16 comments posted 7yrs posted by scientist77017

FM stereo

I wear an armband FM radio for my outdoor running, w/ digital tuning. It has a noise level threshold, which switches fr...

1 comments posted 7yrs

posted by r_delaney2001

1 comments posted 7yrs posted by r_delaney2001

What does 1. reading mean when check resistance

When I have my scale set to 200, what does a 1. reading mean?

9 comments posted 7yrs

posted by scientist77017

9 comments posted 7yrs posted by scientist77017

Experimenting means there will be casualties :-)

This is part of a previous post. Thought I would start a new thread. "https://blog.prayogindia.in/make-laser-light-secu...

15 comments posted 7yrs

posted by scientist77017

15 comments posted 7yrs posted by scientist77017

Purpose of cap on ac line of PC power supply

I am re-purposing a PC power supply and there is a "0.47k" cap across the incoming AC line. What's that for?

5 comments posted 7yrs

posted by BobEngelhardt

5 comments posted 7yrs posted by BobEngelhardt