| Although newer types of solar cell have come to the fore recently, amorphous cells are bound to be with us for some time to come, mainly...
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| A standard voltage regulator Type 7805 is inexpensive and easily available, but its maximum current of 1 A can at times prove a handicap....
| The tiny a.f. power amplifier presented here provides an output of up to 250 mW and may be used in a number of applications, for instance,...