![]() Miscellaneous Test leads, alligator clips, flexible hookup Hardware wire, rubber grommets, 3 in. Switch Any SPST (single pole, single throw) switch. Buzzer reed must be adjusted to vibrate at this lower voltage. Battery 3 to 6 VDC (recommend two type-D flashlight cells wired in series). Buzzer 3-6 VDC door buzzer type vibrator (recommend Sears-Roebuck "Dixon" model). NE-51H neon lamps (other l/125th watt lamps such as NE-2, NE-48, or NE-51 canīe used with appropriate mountings). ĬOMPONENTS Table radio output transformers (5 watt, 2500 ohms/3.2-4 ohms), wired in reverse.Unlike a mere continuity light device, this testing tool will not burn Such a device is a valuable shop tool used by engine mechanics to internally time magnetos, and then time them to the engine upon installation. The following transformer numbers were tried and found to be successful (considering inductive reactance and sufficient voltage step-up based on their reactance at the buzzer's vibratingĮRE ARE DETAILS with which you can construct H your own magneto timer, or "buzz-box" as it is often called. To select proper coding, check the numbers stamped on the transformer disregard six digit numbers, if any. The two transformers used are the "T-92 Output" type. The illustrations will give a suggestion as to how you might lay out the components in the box chassis. Parts for this homemade model did not cost the author over $6.00. A timer such as this retails on the market for around $37.95. The lights come on upon opening of the magneto points, and a variable pitch buzzing tone gives you audible indications in conjunction with the lights. Two indicating lights give accuracy in synchronizing the timing of two magnetos, or when one is timed a certain number of degrees before the other. The circuit will absorb all current from the magneto with no danger of the engine firing while adjustments are being made. Out like a continuity light will if placed across the magneto spark gap, which it is necessary to do when timing. Your Own Magneto Timer By George Adams P. ![]()
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