Epson L90P - TM Two-color Thermal Line Printer Manual de usuario Pagina 37
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0.1
UNIVERSAL
FREQUENCY
COUNTER
Popular
Electronics
Un
¡'versal
yrequency
Counter
BY DON LANCASTER
Part
1
Note: Construction of modules
for
the
Counter appeared in
the
March issue.
April,
1969
Assembly of Complete Unit. The
circuit
for
the
overall
counter
is shown in Fig.
17, while Fig. 18
shows the
interior
of
the chassis. The vinyl -clad case that
comes with the complete
kit is punched
and machined, and
includes
assembly
in-
structions. If you select another type
of
enclosure, use Fig.
18
as a general
layout
guide.
An optional
dialplate
(see
Parts
List for Fig. 17) adds a professional
touch
and also serves as
a front -panel
layout
template.
Modules
Ml through M6 are arranged
in a
line
along the
front of the case.
supported
by brackets similar
to
those
used on the
"Digital Volt- Ohmmeter"
(POPULAR
ELECTRONICS, December 1968 ) .
The three decimal
-point indicator
lamps
are placed
between the decade
units as
shown in the photo,
while the
Power
Supply
module (M7)
mounts on the rear
wall
of
the
chassis
with spacers and 6
hardware.
The fuse (F1) and power
transformer (T1) are
mounted on the
bottom
of
the
chassis.
Note that the
frame of input jack J2
is isolated (insulated)
from chassis
ground and
has an independent ground
lead, called a "guard,"
running directly
to the
M1 board. This
lead is very im-
portant
since it
prevents
any
internally
generated ground
noise from
interfering
with the
input.
Use
nylon washers to
insulate
the jack
from the
chassis.
Don't forget the individual
ground
leads
from each module to
the power
41
- "IT'S 1
- TEACHER 2
- Than Any Other 3
- Reliability 5
- Mc DONALD 6
- COMPANY 7
- FROM OUR 8
- Youcanpay6OOand 9
- POPULAR 10
- - BATTERY 11
- -all -new 12
- 98 is the 13
- 300-300 14
- Hobby 16
- The Leader 17
- I'd 18
- Expanded 19
- -not to mention 20
- $'50 21
- "Perfectune," 22
- HANDBOOK 23
- PREMIER MOREL 24
- $29 .5. ICKE CO 24
- IN FINEST 24
- L.I., N.V 24
- Experimenter 25
- -though 26
- 22 mA 27
- 88 -to 28
- LZ is made of 6 turns 29
- 8. The 30
- Ji and power switch 31
- Generator 32
- R2- 10,000 -ohm 33
- Remmert 34
- Institute 35
- Transformer 36
- Popular 37
- (starting 38
- -6 and 39
- 1968, or 40
- -0.7 volts 41
- Parts location 42
- G'amtro! 43
- R1- 100,000 -ohm 44
- Testing 45
- As examples of 46
- Medical 47
- DID YOU KNOW 48
- Current 49
- -18 -ohm 50
- 0.001 to get the 51
- -a light 52
- Placing 53
- -volt a.c 54
- PEHINII" 55
- -China's 56
- East and 57
- ELECTRONICS 58
- ... and 59
- Antenna 60
- 68 -ohm 61
- Telltale 63
- -27 -ohm. 1G -wall 64
- R3- 4700 65
- Insert the 66
- Si is in 67
- IC in its 68
- IC using 68
- Electronic 69
- ,Grnr'al 70
- R'-- 'S -olun 70
- 71
- Shutter Control in 72
- -are sometimes 73
- E<VáÚ 74
- Features 75
- TERADO TRAV -ELECTRIC 76
- SQUIRES 77
- SANDERS 77
- AMATEUR 78
- Rochester, April 79
- $1,000,000 damages -for 79
- -rather 80
- %HORT-WAVE 81
- LISTENING 81
- Training 82
- RC,' 83
- Loggings 84
- -Melbourne's 84
- -Also listed last 85
- -ZFY, R. Demerara 85
- !' 86
- Ql's 87
- Oh lockout/Screw 88
- Simpson 89
- INTRATEC 90
- DIALING 91
- Inc., Tech 92
- .Which of these 93
- ACADEMY 93
- 0150" 94
- Of /Qyeezi,eosuit4nC 95
- A B O O 96
- ISCOTT® 97
- Your NTS 98
- - loaded 99
- This is 100
- C It mCas 101
- EMPIRE's 102
- MONITOR 103
- " cs 104
- SERVICE 105
- Iyine9ard 106
- Relaxing 107
- Background 107
- BREAKTHROUGH 108
- MARKET PLACE 109
- 1 pound junk -box goodies 110
- AND RECORDERS 111
- - (Payment 112
- - Stutter - No more. (Dr 113
- TELEVISION 114
- Johnson 115
- 7arguments 116
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