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| Circuits Designed
by Dave Johnson, P.E. : |
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Plus And Minus DC Power
Supply - This is a classic example of a regulated
DC power supply that produces both a positive 15v and a negative 15v from a 20vac wall adapter . . . [Hobby
Circuit designed by David A. Johnson P.E., 10/16/05]
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RS-232 Serial
Interface Status Indicator Circuit - I designed
this circuit many years ago and have used it several times since. It uses a single logic IC to indicate the
TXD and RXD line activity of a typical RS-232 serial data communications link. The thresholds are set at plus
3 volts and minus 3 volts. Two dual color LEDs are used as indicator lights . . . [Hobby Circuit designed by
David A. Johnson P.E., 12/09/07]
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists,
students & inventors:
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Plus And Minus DC Power
Supply - This is a classic example of a regulated
DC power supply that produces both a positive 15v and a negative 15v from a 20vac wall adapter . . . [Hobby
Circuit designed by David A. Johnson P.E., 10/16/05]
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Power Supplies &
Regulators - includes several designs, scroll down.
new low power discrete switcher. . .
Power Supplies &
Transformers - Basic structures of power supplies. .
. [Designer's name not included] |
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RS-232 Serial
Interface Status Indicator Circuit - I designed this
circuit many years ago and have used it several times since. It uses a single logic IC to indicate the TXD and
RXD line activity of a typical RS-232 serial data communications link. The thresholds are set at plus 3 volts and
minus 3 volts. Two dual color LEDs are used as indicator lights . . . [Hobby Circuit designed by David A. Johnson
P.E., 12/09/07]
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