The Vx2SE solar engine

Posted on Mar 11, 2013

The Vx2SE is a simple discrete voltage-doubling SE for driving an LED. If the load is a red or green LED, J1 is used together with just one red or green LED for threshold detection (no 1381). For driving a blue LED use two green or red LEDs in series and may require a higher voltage (3V) solar cell. With 100uf capacitors the flash frequency is 2-3Hz and the R2 and R3 resistors may be omitted. With very large capacitors (0.01F and up) the frequency is much lower and the resistors can be optimized to stretch the LED `on` time.

The Vx2SE solar engine
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