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georgi.oreshkov
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| Здравсуйте колеги из Росия . Мне попала етот щука 10 мг гц осцилоскоп .Но у его нет горизонтальная разветка .У меня есть большой опит в любитеское конструирование осцилоскопов .Но с прехождение другий времян уже это не нужно .Осцилоскоп сделан в Венгрии. Я успел снят сервисное описание и схем. Нам схема обычная два компаратора SN72720N. Там 2щук .Можете ли сказать эст ли рускии аналог SN72720N? И двух схем сгорели.Вот попробую схему посылат.Не получилось но другой способ http://www.onlinedisk.ru/file/606577/ Здесь схема |
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n max
Модератор
Сообщения: 16645
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| ближайшее,не совсем совпадающее по ногам к140уд20 |
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RUZIK40
Фанат форума
Сообщения: 3817
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TL820C SN72720N
TYPE TL720C DUAL DIFFERENTIAL COMPARATOR
NOT RECOMMENDED FOR NEW DESIGN
FOR NEW DESIGN, USE TL820C
schematic (each comparator)
JOR N DUAL-IN-LINE PACKAGE (TOP VIEWI
COMPARATOR NO. I
COMPARATOR NO.2 INV INV ~ VCC- INPUT INPUT GNO VCC NC OUTPUT
NOftI~~TlNG
INVIAltNG
IN.", T
OUTPUT:C
---4--0 Ycc-
~~ I~~~T VCC-
COMPARATOR NO. I
Component values shown are nominal.
COMPARATOR NO.2
NC-No internal connection
description
absolute maximum ratings over operating temperature range (unless otherwise noted)
Supply voltage V CC+ (see Note 1) Supply voltage VCC- (see Note 1) Differential input voltage (see Note 2) Input voltage (any input, see Note 1) Peak output current, each comparator (tw . 1 s) Continuous total power dissipation: each comparator tota I package Operating free-air temperature range . . . . Lead temperature 116 inch (1, 6 mm) from case for 60 seconds: J package Lead temperature 116 inch (1, 6 mm) from case for 10 seconds: N package
NOTES:
1. All voltage values, except differential voltages, are with respect to the network ground terminal. 2. Differential voltages are at the non inverting input terminal with respect to the inverting input terminal.
TEXAS)NSTRUMENTS
INCORPORATED
POST OFFICE BOX 225012. OALLAS. TEXAS 75265
TYPE TL720C DUAL DIFFERENTIAL COMPARATOR
electrical characteristics at specified free-air temperature, Vcc+ (unless otherwise noted)
PARAMETER
VIO "VIO 110 liB VICR VID AVO VOH VOL ro ICC+ ICCI nput offset voltage
Average temperature coefficient
TEST CONDITIONS
MAX UNIT
of input offset voltage
Input offset current
I nput bias current Common-mode input voltage range
Differential input voltage range Large-signal ditterential
voltage amplification
High-level output voltage
Low-level output voltage
Output resistance
Supply current from VCC+ (each comparator) Supply current from VCC- (each comparator)
Total power dissipation (each comparator)
CMRR Common-mode rejection ratio
NOTE 3:These characteristics are verified by measurements at the following temperatures and output voltage levels:
TEST CONDITIONS
No load. See Note 4
Response time
NOTE 4: The response time specified is for a 100-mV input step with 5-mV overdrive and is the interval between the input step function and the instant when the output crosses 1.4 V.
TEXAS INSTRUMENTS
Взято здесь - http://www.datasheetarchive.com/datasheet-pdf/Scans-006/Scans-00139165.html
Итого ищем TL820C |
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