29 ms·
Yeah, I'm no electronics expert (far from it), but that part also confused me. Can someone explain?
by henpa 12y ago
Yeah, I'm no electronics expert (far from it), but that part also confused me. Can someone explain?
- jonathonf 12y agoDepending on the supply requirements, he might use voltage ripple as a reference. With an unsmoothed rectified supply you get a nice "pulsed" input anyway: http://falstad.com/circuit/#%24+1+5.0E-6+1.8479586061009856+53+5.0+50%0Av+128+272+128+64+0+1+50.0+5.0+0.0+0.0+0.5%0Ad+224+128+288+64+1+0.805904783%0Ad+224+128+288+192+1+0.805904783%0Ad+288+192+352+128+1+0.805904783%0Ad+288+64+352+128+1+0.805904783%0Aw+128+64+288+64+0%0Aw+288+192+288+272+0%0Aw+288+272+128+272+0%0Aw+224+128+224+368+0%0Aw+224+368+464+368+0%0Aw+352+128+464+128+0%0Ag+224+368+224+400+0%0Ar+464+128+464+368+0+100.0%0AO+464+128+528+128+0%0Ao+13+64+0+34+5.0+9.765625E-5+0+-1%0A http://falstad.com/circuit/#%24+1+5.0E-6+1.8479586061009856+...
- smoyer 12y agoTrue but you'd expect that to be 120Hz rather than 60Hz.
- jonathonf 12y agoSo you could: a) use a half-rectified supply b) halve the count. A) would be easier. :)
- smoyer 12y agoTrue ... not so good for efficiency and you'd need a bigger smoothing capacitor. (I'm assuming since this is all discrete, there's no need for a fully regulated power supply).
- morcheeba 12y agoYou'd want a fully regulated power supply for this, /especially/ because it's discrete. You want the LEDs to remain constant brightness, but, more importantly, you don't want an unregulated power supply to overvolt and destroy all this hard work.
- dogma1138 12y agoUse a diode so you only get half of the sin waves, that's 60hz which makes it very easy to build a clock off since you don't need to do any multiplications on the base clock frequency it self.
- deleted 12y ago[deleted]