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KIT 83

UNIVERSAL DUAL POLARITY 1 AMP POWER SUPPLY

Courtesy/Thanks to: www.kitsrus.com

Description: Many times the hobbyist wants to have a simple, dual
polarity DC power supply for a project. Existing power
supplies may be too big either in power output or physical
size. Just a simple power supply is required.
For most non-critical applications the best and simplest
choice for a voltage regulator is the 3-terminal type. The 3
terminals are input, ground and output. The 78xx & 79xx
series can provide up to 1A load current and it have onchip
circuitry to prevent damage in the event of over
heating or excessive current. That is, the chip simply shuts
down rather than blowing out. These regulators are
inexpensive, easy to use, and they make it practical to
design a system with many PCBs in which an unregulated
supply is brought in and regulation is done locally on each
circuit board.
This kit provides a dual DC power supply. With the
appropriate choice of transformer and 3-terminal voltage
regulator pairs you can easily build a small power supply
delivering up to one amp at +/- 5V, +/- 9V, +/- 12V, +/-
15V or +/-18V. You have to provide the centre tapped
transformer and the 3-terminal pair of regulators you want:
7805 & 7905, 7809 & 7909, 7812 & 7912, 7815 & 7915
or 7818 & 7918. We have provided the PCB and other
components necessary. Note that the + and - regulators do
not have to be matched: you can for example, use a +5v
and -9V pair. However, the positive regulator must be a
78xx regulator, and the negative a 79xx one.
We have built in plenty of safety into this kit so it should
give many years of continuous service. Voltage regulators
have not been supplied. The user must choose the pair he
needs for his particular application.

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Files
k83.pdf
   Description of the kitsrus Kit 83 Power Supply
10100083.jpg
   Picture of the KIT83 PSB
10100083.jpg
   Picture of the KIT83 PSB
Parts used
LM7905
   5V Negative Voltage Regulators
LM7915
   15V Negative Voltage Regulators
LM7815
   7815 15V Positive Voltage Regulator
LM7805
   5V Positive Voltage Regulator
1N4004
   General Purpose Rectifiers
LM7812
   3-Terminal 1A Positive Voltage Regulator
LM78L05
   5V 3-Terminal Positive Regulators
LM78L09
   9V 3-Terminal Positive Regulator
LM78L12
   3-Terminal Positive Regulators
LM78LXX
   3-Terminal Positive Regulators