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3345 $39.95

AN books are- hardcover unless number followed by a "F1" for paperback. Prices Stiuwn)

3345 $39.95

AN books are- hardcover unless number followed by a "F1" for paperback. Prices Stiuwn)

Check out those surplus crystals with this portable circuit

ay ne Green's book Practical Test Instruments You Can Build [currently out-of-print]contains a very useful circuit for a crystal tester developed by Mike Kaufman, It's a good, simple, portable and very handy test item. But with a few modifications il can be made better.

Modifications

See Figure 1 for the original circuit. If you

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