This must be a really really common problem and the only reason it is diffi= cult to find on youtube is the wrong search terms: If a device has a power on button latch switch and you want it to turn on a= nd off like a light bulb, i. e., when the power supply is plugged in or a r= elay connects the power, or for solar, when the sun comes up, is it a commo= n solution to run a wire from the power supply through a cap and maybe a la= rge drain resister in parallel then to one side of the latch switch? The current would flow through the cap just long enough to set the latch sw= itch before the cap is charged and stops the flow. Then the device turns on and stays on until power is disconnected. The pro= cess can repeat after the charge drains off the cap. First check the voltage through the on switch is the same as the power supp= ly. (This will not werk on a lap top.) I'd need some idea of the time it takes to latch and some thresh hold volta= ge for the latch to select the cap and resister. Maybe look at it on an os= cilloscope.
Really Basic Power On Question
Started by ●February 16, 2021
Reply by ●February 19, 20212021-02-19
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Bret Cahill wrote:> This must be a really really common problem and the only reason it is > difficult to find on youtube is the wrong search terms: > > > If a device has a power on button latch switch and you want it to turn > on and off like a light bulb, i. e., when the power supply is plugged > in or a relay connects the power, or for solar, when the sun comes up, > is it a common solution to run a wire from the power supply through a > cap and maybe a large drain resister in parallel then to one side of > the latch switch?don't follow your description here at all. Are you just trying to figure out a "simple" way to pulse a latching relay's coil long enough for it to set? Note that in order to reset a latching relay, one normally needs to drive a secondary coil, or reverse the current flow in a single coil model; so if I'm understanding your question properly, you're never actually going to "unlatch" the relay. -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE3asj+xn6fYUcweBnbWVw5UznKGAFAmAvtB4ACgkQbWVw5Uzn KGBrSxAAoFvVmlRMMMicwRGAnjAtX/oQRumYcTUUq4XsDcWG1mLRQExYBcR2PiO+ VYjYgxZESLmobjSdoVn02MLCvW2qBmtDyLAR9+c0hR9dycT8O4XH48rfKFVm2lKA leJq0DZKJyCqQd0mtAZNT5OOo9BVqIqIEVZhe/ZD8BeoRqtx6oAk6lk9/Yzd9Z2Y JW3wriI0cSZ1JiJ7yo5eHdCp32jug693BwhFvcVeL+4ltrt8yhLM3fPdqjd1HoUx mOWO+hNpkZWYtZRkImfvSswXNts/i3k4cg/DLaZmaSqBaHI8TfgEk/+zi1N8Dbjy fwOj0bvdVnJyizI0Y4KN6ahzpvo4A0FUq5IGelzFvyJopM1HE+fy7xr3uN/0FNrq f9oqblW8cDv5fDeGO+wn9GJtepdqxM4eLfa/SJOZ/ggLxeDhGR5v9DxWvgfOqjXY igQuuotbibW92YsYwNcOgaI/+LPtmZCTkj8mNtvz/CCpoH/fJ1T7FJON+EZ/+Pg4 JTkhSkG4VpQfejsGBD8dHGqV2kfxWOvMp3EPrEXKr2biNFTlQghbOdTDgqRCFL1j CTWsuaZgdUB2phY+sGP+f+mQSEe8vXNH0qY/Zta0i2wF2jiUdAwaWVZ0I2ViMbe0 rRSfO/CklETGrd1h52N3qG6uozrj48rsU66JwjMFOb4et7u2+ZA= =CM+M -----END PGP SIGNATURE----- -- |_|O|_| Github: https://github.com/dpurgert |_|_|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860 |O|O|O| Former PGP: 05CA 9A50 3F2E 1335 4DC5 4AEE 8E11 DDF3 1279 A281