AVT-1572 Symmetrical Regulated Power Supply User Manual
- June 9, 2024
- AVT
Table of Contents
Symmetrical ±1,25 V…±25 V / 1,5 A
power supply
AVT 1572
ASSEMBLY DIFFICULTY
AVT-1572 Symmetrical Regulated Power Supply
There is no need to convince any practitioner how useful a device a power supply is in the laboratory, while a beginner will quickly learn that nothing can be done without it. The devices being run very often require a symmetrical power supply, and the singlevoltage power supplies can’t always be connected in series to get the voltage you need. Thus, the presented power supply is another device that expands the capabilities of our workshop.
Characteristics
- positive and negative output voltages
- output voltage indicator lights – LEDs
- short circuit and thermal protection
- adjustable output voltages 1,2…25 V DC
- maximum continuous output current: 2×1,5 A
- recommended transformer: 2×17…19 V AC
- board dimensions: 45×81 mm
Circuit description
The schematic diagram is shown in Fig. 1. The reference voltage is set using
the PR1 and PR2 potentiometers. LM317 is a positive voltage regulator while
LM337 is a negative voltage one. LM circuits need only a few external
components and have built-in thermal protection as well as current limiting
when the output is shorted to ground. The output voltage range for a 2✕17…19 V
AC supply is ±1,25 V to ±25 V. The LM317 and LM337 circuits have built-in
short-circuit and When selecting a transformer, pay attention to the voltage
rating of the C1 and C2 capacitors. The transformer should be selected so that
its secondary voltage after rectification through the M1 bridge is no greater
than the rated voltage of the capacitors. thermal protection.
Assembly and start-up
The assembly diagram is shown in Fig. 2. The assembly must start by soldering the “Z” jumper and the last components to be assembled must be the C1 and C2 capacitors, just after screwing the circuits to the heatsink. Insulate the US1 and US2 circuits from the heat sink with a mica or silicone spacer. The assembly is typical, and the circuit, assembled from working components, does not require any adjustment. Once connected to the transformer it immediately works properly.
List of elements
Resistors:
R1, R3:…………………………….2,2k Ω
R2, R4:…………………………….220 Ω
PR1, PR2:………………………..linear 5 kΩ
Capacitors:
C1, C2:…………………………….2200 uF / 35 V
C3, C4, C7, C8:……………….100 nF
C5, C6, C9, C10:……………..10 uF / 63 V
Semiconductors:
US1:…………………………………LM317
US2:…………………………………LM337
D1-D4:…………………………….1N4007
LED1, LED2: ……………………red 3 mm
M1: ………………………………….bridge rectifier
Other:
X1, X2: …………………………….DG301-5.0/3
TO220 silicon washers ×2 Spacers ×2 Screws ×3 Radiator
AVT SPV Sp. z o.o.
Leszczynowa 11 Street,
03-197 Warsaw, Poland
kity@avt.pl
This symbol means do not dispose of your product with your other household
waste. Instead, you should protect human health and the environment by handing
over your waste equipment to a designated collection point for the recycling
of waste electrical and electronic equipment.
AVT SPV reserves the right to make changes without prior notice. Assembly and
connection of the device not in accordance with the indications within the
instructions, arbitrary change of components and any structural modifications
may cause damage to the device and expose users to harm. In such a case, the
manufacturer and its authorized representatives shall not be liable for any
damages arising directly or indirectly from the use or malfunction of the
product.
DIY kits are intended for educational and demonstration purposes only. They
are not intended for use in commercial applications. If they are used in such
applications, the buyer assumes all responsibility for ensuring compliance
with all regulations.
https://serwis.avt.pl/manuals/AVT1572_EN.pdf
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