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Sources for 3 Vdc

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Audioguru:
There are good Name-Brand AA alkaline cells available and there are junk ones from China that are labelled Super Heavy Duty. Many of the Chinese ones are dead before they are sold.
You showed Radio Shack AA cells. I never tried them.

ArthurDent:

--- Quote from: fixit7 on June 10, 2019, 03:13:30 am ---
--- Quote from: ArthurDent on June 10, 2019, 02:57:22 am ---1) The LMC555 (CMOS) version of the regular 555 timer is designed to work down to 1.5 volts at very low power.
2) please reread and understand what many have been telling you about no battery lasting close to the time you say you want.

This CMOS 555 circuit may have some useful info. It can flash an LED for up to 6 months on two AAA batteries.
https://www.allaboutcircuits.com/textbook/experiments/chpt-8/cmos-555-long-duration-minimum-parts-red-led-flasher/

--- End quote ---

It uses a S8550 transistor instead of the ne555.

--- End quote ---

How are you powering your source? Whether you can detect light or not is meaningless unless you have a source that will last an equally long time. If you're using a handheld laser it won't last long at all on the small internal batteries. A continuously powered visible LED won't be much better. That post of mine had some useful information that you are completely ignoring. People are trying to help you but you're not making it easy. Scattering your questions over multiple topic is making it nearly impossible. good luck.

fixit7:

--- Quote from: ArthurDent on June 10, 2019, 04:04:10 am ---
--- Quote from: fixit7 on June 10, 2019, 03:13:30 am ---
--- Quote from: ArthurDent on June 10, 2019, 02:57:22 am ---1) The LMC555 (CMOS) version of the regular 555 timer is designed to work down to 1.5 volts at very low power.
2) please reread and understand what many have been telling you about no battery lasting close to the time you say you want.

This CMOS 555 circuit may have some useful info. It can flash an LED for up to 6 months on two AAA batteries.
https://www.allaboutcircuits.com/textbook/experiments/chpt-8/cmos-555-long-duration-minimum-parts-red-led-flasher/

--- End quote ---

It uses a S8550 transistor instead of the ne555.

--- End quote ---

How are you powering your source? Whether you can detect light or not is meaningless unless you have a source that will last an equally long time. If you're using a handheld laser it won't last long at all on the small internal batteries. A continuously powered visible LED won't be much better. That post of mine had some useful information that you are completely ignoring. People are trying to help you but you're not making it easy. Scattering your questions over multiple topic is making it nearly impossible. good luck.

--- End quote ---

I do the best I can.

I make mistakes.

This is the laser I am using.

Depending how fast it depletes batteries will determine if I use batteries or a transformer.

Laser diode parameters:
Name: Laser small bronze head (red)
Transmit power: 150mW
Standard size: Φ6 * 10.5
Spot mode: point-like spot, continuous output
Laser wavelength: 650nm (red)
Optical power: <5mW
Supply voltage: 3VDC
Working current: <25mA

Audioguru:
You still have not posted a schematic of the transistor Laser Beam-blocked Detector. Since the base-emitter junction of a transistor is affected by temperature then the beeper might not activate when the transistor is warm in summer.

fixit7:

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