Solid tinned wire meets circuit board

Started by AK in sci.electronics.basics1 month ago 16 replies

Try not to laugh too hard. I think I may need a video on how to connect components on a...

Try not to laugh too hard. I think I may need a video on how to connect components on a board. https://www.dropbox.com/s/8iuqo9iu0em42d5/first2.png?dl=0 https://www.dropbox.com/s/kuqpwpxxl24b6zc/first1.png?dl=0


Piezo buzzer - no polarity marks

Started by AK in sci.electronics.basics1 month ago 7 replies

I got this, but saw no polarity markings like my other larger piezo buzzer. Andy Piezo Transducer Electrical Specifications: Rated...

I got this, but saw no polarity markings like my other larger piezo buzzer. Andy Piezo Transducer Electrical Specifications: Rated Voltage: 5Vp-p Rated Current: 2mA (max) Sound Output at 10cm: 85 dBA Resonant Frequency: 2.04kHz Dimensions: 8.43mm H x 12.1mm diameter Number of pins: 2 Pitch: 6.5mm Lead thickness: 0.62mm PC mount Markings: 1...


PIR motion detector circuit

Started by AK in sci.electronics.basics1 month ago 6 replies

I wanted to try this next, but wanted to know if it looks like it has a good chance of...

I wanted to try this next, but wanted to know if it looks like it has a good chance of working. https://circuitdigest.com/electronic-circuits/pir-sensor-based-motion-detector-sensor-circuit Andy


What determines a low leakage capacitor?

Started by AK in sci.electronics.basics1 month ago 20 replies

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

I am trying to find info about what a low leakage capacitor is. I read that aluminum electrolytic caps have a higher leakage rate than most other types. How do you determine if a capacitor is low leakage? I was looking at this one. 0.1µF 250 Volt 10% Metallized Film Capacitor Axial Specifications Capacitance: 100000 pF / 100 nF / 0.1µF Voltage rating: 250 VDC


Removing solder

Started by AK in sci.electronics.basics1 month ago 10 replies

I use my desolder gun to remove solder from circuit boards but I can't always remove enough especially when the solder is in stranded wire. Is...

I use my desolder gun to remove solder from circuit boards but I can't always remove enough especially when the solder is in stranded wire. Is there some other technique? Andy


Frustration

Started by AK in sci.electronics.basics1 month ago 63 replies

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

Electronic can be quite frustrating. I put together a circuit for a laser alarm. It does not work. There is no way to tell if a design will be successful even if you follow the authors exact directions. I will keep plugging away and reading Practical Electronics for Inventors. :-)


Resistance Light and Dark Values

Started by AK in sci.electronics.basics1 month ago 27 replies

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

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


PC PSU repurposing

Started by Bob Engelhardt in sci.electronics.basics1 month ago 10 replies

I am going to repurpose a PC PSU & I have a question about minimum loading. Many/most PSU's require minimum loads on their outputs for the...

I am going to repurpose a PC PSU & I have a question about minimum loading. Many/most PSU's require minimum loads on their outputs for the outputs to be powered, The PSU that I have powers its outputs without loads. Is it a bad idea to run it that way? Thanks, Bob


More Math I Never Did

Started by Anonymous in sci.electronics.basics1 month ago 18 replies

Inductors. Where: R=radius D=diameter l=length N=number of turns L=inductance Then it is L=(N^2 x D^2)/((18 x D) + (40 x l)

Inductors. Where: R=radius D=diameter l=length N=number of turns L=inductance Then it is L=(N^2 x D^2)/((18 x D) + (40 x l)


Dark silver wire

Started by Andy in sci.electronics.basics1 month ago 8 replies

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 a Al forms a non...

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 a Al forms a non conductive oxide on exposure to air.


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