Uploaded September 2023 | Updated September 2026, 3 weeks ago
Alternately Flash 2 LEDs with One Transistor
Get solderstick at 20% OFF with discount code "LE20" at solderstick.com/sale
In this video we look at a circuit that published in Forrest Mims, "Timer, op Amp Circuits and projects book. On page 91 is the Dual LED Flasher. This circuit uses a self flashing LED, a standard 5mm LED and a transistor to alternately flash the LEDs. When the Self Flash LED (SFL) is "on" no current flows into the base of the 2n2222 transistor, so the other LED is off. When the SFL is off, current flows into the base of the 2n2222 and the standard LED is on.
1. Autumn Promotions links: elecrow.com/back-to-school-sale?ann=learn
2. Link to the special promotion for PCBs, 3D printing, and acrylic laser cutting: elecrow.com/special-offer.html?ann=learn
3. PCBA Automotive Services promotion link: elecrow.com/maker/ad/iatf/?annlearn
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*Please help support this channel at NO COST TO YOU. If you shop on* *Amazon, please use this link: amzn.to/3706t6c *
*I will get a small commission and it costs you nothing. *
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HEY YOU ABOUT TO POST SOMETHING STUPID:
Yes, I know my hands are large/fat. It's because of a heart condition I suffer from called Congestive Heart Failure. Here's a link to some information about CHF: https://cle.clinic/2TdS2Ux
One of the symptoms is that it causes fluid retention, mostly in the hands, feet/ankles, and face..
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Support learnelectronics:
Amazon Store:
If you are shopping for electronic components, test gear or consumables please consider visiting my Amazon shop @ amazon.com/shop/learnelectronics
Patreon:
Please check out patreon.com/learnelectronics and pledge a dollar if you can. It will go a long way to keeping the channel alive. It costs a bit of money to buy all the items and produce these videos. Your help is appreciated.
Paypal:
Or....if you'd like to send a one-time donation you can use this link: paypal.me/learnelectronics
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Gear I use:
Multimeter: OWON B33+ amzn.to/3UkTJOo
Oscilloscope: KIPRIM DS1202 amzn.to/3gfJGMN
Signal generator: Junctek JDS8080 shorturl.at/ehTZ1
Component Tester: T7 Multifunction amzn.to/3AYY03v
Soldering Station: Sealody ???????
Alternately Flash 2 LEDs with One Transistor
Get solderstick at 20% OFF with discount code "LE20" at solderstick.com/sale
In this video we look at a circuit that published in Forrest Mims, "Timer, op Amp Circuits and projects book. On page 91 is the Dual LED Flasher. This circuit uses a self flashing LED, a standard 5mm LED and a transistor to alternately flash the LEDs. When the Self Flash LED (SFL) is "on" no current flows into the base of the 2n2222 transistor, so the other LED is off. When the SFL is off, current flows into the base of the 2n2222 and the standard LED is on.
1. Autumn Promotions links: elecrow.com/back-to-school-sale?ann=learn
2. Link to the special promotion for PCBs, 3D printing, and acrylic laser cutting: elecrow.com/special-offer.html?ann=learn
3. PCBA Automotive Services promotion link: elecrow.com/maker/ad/iatf/?annlearn
*************************************************************************
*Please help support this channel at NO COST TO YOU. If you shop on* *Amazon, please use this link: amzn.to/3706t6c *
*I will get a small commission and it costs you nothing. *
*************************************************************************
HEY YOU ABOUT TO POST SOMETHING STUPID:
Yes, I know my hands are large/fat. It's because of a heart condition I suffer from called Congestive Heart Failure. Here's a link to some information about CHF: https://cle.clinic/2TdS2Ux
One of the symptoms is that it causes fluid retention, mostly in the hands, feet/ankles, and face..
-------------------------------------------------------------------------------------------------------------------
Support learnelectronics:
Amazon Store:
If you are shopping for electronic components, test gear or consumables please consider visiting my Amazon shop @ amazon.com/shop/learnelectronics
Patreon:
Please check out patreon.com/learnelectronics and pledge a dollar if you can. It will go a long way to keeping the channel alive. It costs a bit of money to buy all the items and produce these videos. Your help is appreciated.
Paypal:
Or....if you'd like to send a one-time donation you can use this link: paypal.me/learnelectronics
---------------------------------------------------------------------------------------------------------------------
Gear I use:
Multimeter: OWON B33+ amzn.to/3UkTJOo
Oscilloscope: KIPRIM DS1202 amzn.to/3gfJGMN
Signal generator: Junctek JDS8080 shorturl.at/ehTZ1
Component Tester: T7 Multifunction amzn.to/3AYY03v
Soldering Station: Sealody ???????
