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I'm a hot rodder/custom car guy. Those diamond cutting wheels and a "pencil" style air grinder are used to cut windshields when you chop the top on a car. Works much better than the old way of using a glass cutter and lighter fluid to cut safety glass like in the old days.
What you can get for a Buck.
- Thread starter RichardO
- Start date
Here is the latest LED flashlight from Dollar Tree. At only a Buck you don't get batteries. For another Buck you can get 8 heavy duty batteries.
For your Buck you get a white LED, a battery holder for 3 AAA cells, a nice lens and a push on-push off switch.
The battery holder is nice since it works in all the small flashlights I have. So, when I destroy the LED by running it on too high a current I can use the battery holder to hold standby batteries for one of my other flashlights. One of these flashlights in in my bicycle pouch for emergencies after dark.
The resistor looks like it is 10 ohms, 1/8 watt. that would be about 100ma through the LED when the batteries are new. I'm tempted to lower the value of the resistor. Better yet, maybe I will add a constant current source to replace the resistor. It looks like there is room for a DIP LM10 and an NPN transistor.
For your Buck you get a white LED, a battery holder for 3 AAA cells, a nice lens and a push on-push off switch.
The battery holder is nice since it works in all the small flashlights I have. So, when I destroy the LED by running it on too high a current I can use the battery holder to hold standby batteries for one of my other flashlights. One of these flashlights in in my bicycle pouch for emergencies after dark.
The resistor looks like it is 10 ohms, 1/8 watt. that would be about 100ma through the LED when the batteries are new. I'm tempted to lower the value of the resistor. Better yet, maybe I will add a constant current source to replace the resistor. It looks like there is room for a DIP LM10 and an NPN transistor.
... Speaking of flashlights for a Buck...
The 9-LED flashlights from Harbor Freight are now a single LED. For 3 Bucks you get 2 flashlights _and_ batteries.
For a Buck and a half you get an LED and resistor mounted on a PCB, 3 batteries, a battery holder, a conical reflector, a window and a push on-push-off switch. The resistor is 1 ohm. This is much less than the on in the 10 ohms in the Dollar Tree flashlight. And, yes, the battery holder is the same as the one in the Dollar Tree flashlight.
I had to use a diamond cutoff wheel and some big pliers to open the case for the pictures. I tried to press the window and LED board out of the case but there was no give whatever. I think both the window and LED circuit board are already pressed tight against lips in the case. The LED circuit board has partial plated holes on the edge to make contact to the case. The center of the PCB appears to be the contact for the positive of the battery holder.
The 9-LED flashlights from Harbor Freight are now a single LED. For 3 Bucks you get 2 flashlights _and_ batteries.
For a Buck and a half you get an LED and resistor mounted on a PCB, 3 batteries, a battery holder, a conical reflector, a window and a push on-push-off switch. The resistor is 1 ohm. This is much less than the on in the 10 ohms in the Dollar Tree flashlight. And, yes, the battery holder is the same as the one in the Dollar Tree flashlight.
I had to use a diamond cutoff wheel and some big pliers to open the case for the pictures. I tried to press the window and LED board out of the case but there was no give whatever. I think both the window and LED circuit board are already pressed tight against lips in the case. The LED circuit board has partial plated holes on the edge to make contact to the case. The center of the PCB appears to be the contact for the positive of the battery holder.
