Home Motor drivers Solar engines Type 1 (voltage) Type 2 (time) Type 3 (charge rate) Nocturnal D1 SIMD1 V0 SIMD1 V1 SIMD1 V2 SIMD1 V3 SIMD1 / Solar Regulator SmartCap Sensors Complete robots Misc. circuits   The BEAM Circuits Collection is a BEAM Reference Library site.		Wilf Rigter's SIMD1 V3 Part of a family of nocturnal solar engines (all circuits on this page © Wilf Rigter ; note that the majority of this explanatory text comes from either postings by, or correspondence with Wilf) The SIMD1 V3 is very similar to the NPN flavor of SIMD1 V2, but with the addition of a FET on the output line. This makes life easier for its attached load (since there's no need here for something that can use an "enable line"), by providing power that's just "there" in the dark. Here the FET is used to sink load current from a pummer, motor, or whatever. Turn-on is crisp, and the circuit switches rapidly when the light drops just a little. As with the other SIMD1 circuits, the 1M resistor across the solar cell can be changed to a smaller value (i.e. 100K) to adjust sensitivity and make it turn on even faster (with a corresponding loss in charge efficiency). Parts list for basic circuit Part Solarbotics Digikey Radio Shack Storage capacitor various various various Solar cell various N/A N/A 2N3904 Transistor $0.15, #TR3904 $0.26, #2N3904-ND $0.07, #900-5456 FET 2 X 1 MOhm resistors @ $0.20, #R1.0M 5 for $0.28, #1.0MQBK-ND @ $0.07, #900-0291 I suspect that the FET could be replaced with a PNP transistor, but haven't tried this yet... eGroups beam and alt-beam mailing list discussion on this design SIMD1 V3 was introduced in alt-beam list message #13744
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