Heathkit IO 4541 Schematic

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Extracted text from Heathkit IO 4541 Schematic (Ocr-read)

Page 4

ssv -----

5v -----

INTENSITY

n25
25K

R407
33 K

POWER SUPPLY
CIRCUIT BOARD

(22

IE;

No
$600M:

JRAII

I.»

IC 40

OPTICAL
ISOLATOR

MI:

TIL II5

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Email-
55-15

choaw
8000

+
::cm
Izoopr

as aw

I+

D309
555. so:

_J (203
A no

NTS.

DNTROL SETTING.

I
i

#275 W cast
was I 220

020B

7-534

INDICATES A CHASSIS GROUND. 11.

NOMINAL, VARYING WITH LINE

INDICATES A He VOLTAGE MEASURED 12.
NT INDICATEDITO CHASSlS GROUND.
s WERE MADE WITH A HIGH IMPEDANCE

NDICATES THAT THE ENCLOSED
CHANGE WITH ,THE CHANGE IN AN

VOLTAGE MEASUREMENTS ON THE SWEEP TRIGGER CIRCUIT
BOARD WERE MADE WITH THE TRIGGER LEVEL CONTROL SET
VERY CLOSE TO ITS CENTER POSITION T0 BALANCE
TRANSISTORS 0304 AND (1305.

VOLTAGES ON THE BASES 0F TRANSISTORS 0106 AND 0206
WILL BE EQUAL TO THE GATE T0 SOURCE VOLTAGE 0F
TRANSISTORS 0103 AND 0203 RESPECTIVELYI

H50V
sounc:

Jii Ivy

ELK.

BLK-VEL

BLK-GRN

ELK-RED

I 50w:

SCHEMATIC OF THE

HEATHKIT®
5 MHz-PORTABLE OSCILLOSCOPE
MODEL lO-4541'

Part of 595-1977-02

PrlnIed In the Unlted Slates of America

120v
JUMPER