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simple 3.3v relay
One of the considerations with not using a transformer is safety. This might be a little oddball, but you could always use a 220-volt, (or two 110-volt in series), small light bulbs, shining onto a small array of solar cells arranged in whatever series/parallel configuration...
Re: how to store voltage?
It sounds like what you want is a sample-and-hold circuit between the F/V convertor and the VCO. The question then becomes, how long do you need the voltage input to the VCO to be held? Are we talking a few seconds or a few weeks?
led ramp circuit
Hey Ian; My initial reaction was to say that that seems like an extraordinarily complex solution to a simple problem. Then I got looking at the link and data closer. Not only does that look like it might be simpler than my original discrete transistor design, but it might even...
led ramp
This should be simple, but its eluding me. When I take the input of the circuit "hi", I want the LED brightness to ramp up. When I take it low, I want it to ramp back down. It would be nice if I could use trim-pots to adjust the ramp times separately, but thats not critical. Ramp times...
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