I have put together the circuit illustrated, the author states that it should work with any colour of LED.
If I use a red LED, it works. Any other apart from orange fails to light.
BUT - if I insert any other colour of LED(s) in parallel to the red LED, they all flash in unison.
Can anyone explain why this should be?
Changing R values varies the flash rate, but makes no apparent difference to which LEDs are useable.
T1 is BC547
R1 is 3K ohm
R2 is 100 ohm
C1 is 470 uF
input is 12V (max 2A).
If I use a red LED, it works. Any other apart from orange fails to light.
BUT - if I insert any other colour of LED(s) in parallel to the red LED, they all flash in unison.
Can anyone explain why this should be?
Changing R values varies the flash rate, but makes no apparent difference to which LEDs are useable.
T1 is BC547
R1 is 3K ohm
R2 is 100 ohm
C1 is 470 uF
input is 12V (max 2A).
Single Transistor LED Flasher Circuit - Homemade Circuit Projects
If you are interested to build a tiny flasher circuit using single transistor and a single LED, then this design will accomplish it.
www.homemade-circuits.com