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Low Power
12,000 Volt Power Supply - If you need about 12, 000
volts DC for an ion generator this circuit might be the ticket. It draws power from the 120vac power line but it
uses a small 6KV camera flash trigger coil. The output signal is isolated from the power line . . . [Hobby
Circuit designed by David Johnson P.E., 03/27/99]
Low-Cost switcher
converts 5 to 24V - 02/16/98 EDN Design Idea (File
contains several circuits, scroll to find this one) In µP/µC systems, you sometimes need to use many output ports
and update all the ports simultaneously. For instance, in systems that use multiplexing techniques, the output
ports require refreshing for every scanning period. One example is a system of multiple dot-matrix LEDs. Suppose
that an N-column, 8x8 LED matrix uses a row-scanning technique. Every eight-dot column of the nth LED connects to
the nth port (n=1. . . N) and the mth row (m=0. . . 7), in which row a switching transistor controls all the
LEDs. . . . [by Paul C Florian, Plano, TX]
Method sets voltage in multiple-output converters - 02/01/01 EDN Design Idea When you design a transformer for any power converter, you face
several compromises. You must trade off core size against the number of primary turns and flux density. Another
trade-off is the number of turns and winding resistan. . . [by Robert Bell, On Semiconductor, Phoenix, AZ ]
Monitors AC Current - This circuit uses a small AC
current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary
winding. The transformer contains a single turn primary with a low 0. 001-ohm resistance. It can easily handle 30
. . . [Hobby Circuit designed by David Johnson P.E., 07/10/06]
Novel
circuit controls AC power - 01/07/99 EDN Design Idea
(contains several designs, scroll to find this one) The simple and inexpensive power-control circuit in Figure
1 uses a readily available fan regulator with built-in phase control. Such fan regulators are limited to
approximately 100W. The circuit in Figure 1 adds two SCRs and a few components to turn the humble fan regulator
into a mighty power controller. The fan regulator operates with a nominal load of 10 to 25W through a lamp, which
also gives a power-level indication. The 1:1:1 pulse transformer completes the circuit. . . . [by Narendra
Paranjape, Tata Chemicals Ltd, Mithapur, India]
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