Hi,
I am a bit of a newbie with electronics but I saw a circuit for a 555 LED latch and had a go at turning a schematic into a finished vero board project. This worked well, so having seen that it has a big brother, the 556 dual timer, I tried designing and implementing another simple cicuit. Now, the first project merely turns an LED on or off with a momentary switch. One press for on, one for off. The 556 dual circuit has two LEDs and switches - and yes, one switch for each LED. All fired up with my previous success, I used TinyCAD and VEECad to produce the stripboard design. Now we come to the issue.... Pressing each switch does indeed turn on and off the associated LED, but unfortunately also turns OFF the other LED if it happens to be on.
I have uploaded the schematic and board design (apologies for the amateurish efforts). I would be very grateful if someone could point out where I have gone wrong.
Notes: The LEDs and their resistors are off board at J7 and J8, and J9 and J10. Power at J5/J6. The momentary switches are across J1/J2 and J3/J4.
Thanks,
alwi
I am a bit of a newbie with electronics but I saw a circuit for a 555 LED latch and had a go at turning a schematic into a finished vero board project. This worked well, so having seen that it has a big brother, the 556 dual timer, I tried designing and implementing another simple cicuit. Now, the first project merely turns an LED on or off with a momentary switch. One press for on, one for off. The 556 dual circuit has two LEDs and switches - and yes, one switch for each LED. All fired up with my previous success, I used TinyCAD and VEECad to produce the stripboard design. Now we come to the issue.... Pressing each switch does indeed turn on and off the associated LED, but unfortunately also turns OFF the other LED if it happens to be on.
I have uploaded the schematic and board design (apologies for the amateurish efforts). I would be very grateful if someone could point out where I have gone wrong.
Notes: The LEDs and their resistors are off board at J7 and J8, and J9 and J10. Power at J5/J6. The momentary switches are across J1/J2 and J3/J4.
Thanks,
alwi
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