Electronic – Circuit design review – battery powered attiny with Zener voltage regulator

circuit-design

Would some kind soul review the design of my circuit? I have a couple of design challenges. I'm using a ATtiny85 with a voltage range of 5.5 V to blink a UV LED with a forward voltage of 3.7 V. It will be battery powered, and I cant use a single cell because it wont achieve the needed forward voltage of the LED.

So, D1 is a Schottky diode intended to protect against accidentally installed the battery backwards. D2 is a zener that is intended to serve a voltage regulator similar to this tutorial. It's meant to keep voltage < 5.1 V.

The ATtiny85 will be programmed using a clamp-on ISP programmer, so there's no connector designed into the circuit.

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How'd I do? Does everything seem okay?

Best Answer

Jonathan already answered your question with significant detail.

However, you can save yourself a lot of bother, and battery life, if you redesign it like this.

schematic

simulate this circuit – Schematic created using CircuitLab

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