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Feedback on soldering effort and circuit analysis

I could use some feedback.

I think I soldered on the right side this time.

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The circuit was working and I made adjustments to a pot.

The pot ranged from 0 -> about 4400 ohms.

I got the circuit already pre-made and it worked ok indoors.

I forgot to record the resistance before I started making adjustments.

I plan on covering the cadmium photocell with a piece of 3 inch PVC to mitigate the effects of sunlight "faking out" the circuit into thinking that the laser beam has not been interrupted.

The s8550 burned up.

More are on order.

Do you think the circuit will work with some changes?

Is there something I can test in the meantime?

The speaker will work down to 1.7 volts.

thanks,

Andy

I think I have frustrated some folks that are helping me.

Reply to
AK
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I don't know what value would be safe, but I would put a resistor of about 1000 to 2000 ohmsin series with the pot to keep it from blowing the transistor if the resistance of the pot is reduced too much.

Yes, yo did solder on the correct side of the board this time. Most often you try to use the copper traces to interconnect the components.

Reply to
Ralph Mowery

Are the copper traces those long sections of copper?

Andy

Reply to
AK

I referred to all the copper as copper tracing.

The long sections are often used for power circuits one being the positive and the other being the negative on more complex circuits. Use whichever is easiest for the plus and minus just do not get them confused as to which one you call the plus and minus.

The copper pads that have from 2 to 5 holes in them can often be used to place the components and you will not need to use much wire to connect the components. Just let the copper pads be the wires. I say copper pads and tracings meaning anything copper on the board.

Reply to
Ralph Mowery

Okay. I replaced my soldering tip as it was smoking a lot and had to work to get solder to melt.

I hope the Hakko type fits my iron. They look the same.

Andy

Reply to
AK

Do what Ralph said to make the circuit more protective for the transistor.

Reply to
Rheilly Phoull

I did.

Andy

Reply to
AK

Should cut down on magic smoke wastage :-)

Reply to
Rheilly Phoull

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