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5answers
3k views

LM7805 heating up

I maked a schematic for trigger a siren 12v by a signal from Raspberry Pi (GPIO18 PWM 3.3V). All the circuit is powered by a power source of 12v 15A (see the image below). SCHEMATIC UPDATED: It's ...
0
votes
1answer
103 views

3-way solenoid valve gets hot

I have this Bosch 3-way valve that I use in a hydronic system. If I run 12V to energize the valve, it gets very HOT! Is that normal with such valves?
0
votes
1answer
60 views

lm35 Temperature Readings are not right after sealing with Hot-melt adhesive (How mush has it Soldering max Temp toleration ?)

I need to seal the LM35 temp sensor so, I used this device for sealing it: The code I have used are: ...
0
votes
0answers
24 views

Can a bad cell cause excessive heat in charging circuit?

Something I have noticed and am curious of. I had a cases where a lithium ion cell, is bad or dead and it seems to cause overheating in the IC chip on the charging circuit Today I was having issues ...
2
votes
3answers
818 views

MT3608 gets very hot only handle 1A

In the datasheet they mention the MT3608 can handle up to 2A however in some stress tests with a load tester it gets already very hot at 1A. It is so hot, it is impossible to touch the board, all ...
0
votes
2answers
280 views

How to regulate voltage of transformer output for nichrome wire

I have a basic CNC machine for cutting EPS foam which uses about 9.5in/23.5cm long straight 28 gauge Nichrome wire as the cutting element. The nichrome wire is powered independently with a 220V-36V 5A ...
6
votes
2answers
1k views

using plumber's copper solder as a “solder paste” for SMD components

Can I ? :D It is what I currently have plenty of lying around and, well... it says S-Sn97-Cu3 at composition If not, could I use regular solder wire, coat the SMT ...
0
votes
2answers
598 views

AC Light Bulb Fade Circuit - Resistors Getting Hot!

I'm building a circuit to slowly fade in (when switched on) and slowly fade out (when turned off) two LED bulbs. The circuit works, but the two 100 Ohm resistors (see picture) are getting very hot (...
0
votes
2answers
97 views

Share same input with 2 different 32AVR Microcontroller

I'm developing a circuit with two warm-redundant micro-controllers. Each uC has to read I2C, analog and digital signals from the rest of the circuit. Should I route the signals directly to the two ...