Login: GUEST @ JH4XSY.14.JNET1.JPN.AS [Tsuchiura]
home | newest check | boards | help index | log | ps | userlogin | send sysop | slog | status forward | bcm news | users | version | remove cookie
G8MNY > TECH 23.08.25 18:34l 87 Lines 4226 Bytes #7 (0) @ WW
BID : 39387_GB7CIP
Subj: Old Venner Counter Type TSA3334
Path: JH4XSY<N3HYM<WY7EMT<GB7BED<GB7JED<GB7CIP
Sent: 250823/0930Z @:GB7CIP.#32.GBR.EURO #:39387 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Feb 11)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
I have been investigating how this very old 1MHz Frequency Counter/Timer works.
It is all done with Germanium PNPs & no ICs! And it uses 4x 2.5cm tall
projected moving number displays, as it was made before Nixi tubes or LEDs!
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ INPUT 0.1-1V 100k//60pF
ｳ _____________ ﾜ ｳ FREQUENCY Range 1Hz-1.2MHz �1 count
ｳ ｳ [] [] [] [] ｳ /~~\ ﾟ ｳ Gate times 1S 10mS 1ms 100uS 10uS
ﾉｵ ｳ [] [] [] [] ｳ ｳ ｳ ﾆｻ PERIOD 0.1uS-99.99mS
ｺｳ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ \__/ ｳｺ Prescalers 1:1 1:10 1:100
ｺｳ � � ﾟ O O ｳｺ COUNT 0-9999 repeating
ｺ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ｺ Ref Output 100kHz 1V
ﾈﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍｼ Supply 115/230V or 12V DC (+ case!)
SCHEMATIC
ﾚﾄﾄﾄﾄﾄﾄｿﾚﾄﾄﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
Inputﾄo/ｴPreampﾃｴBufferﾃ>ｿ ﾚ>ｴGateﾃ>ｿ ﾚﾄ>ｴ1s Countﾃﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｴ0-9 Meterｳ
o ﾀﾄﾄﾄﾄﾄﾄﾙﾀﾄﾄﾄﾄﾄﾄﾙ ｳ ｳ ﾀﾄﾄﾂﾄﾙ ｳ ｳ ﾀﾂﾂﾄﾄﾄﾄﾄﾄﾙ ｳProjectorｳ
Testｳ | | | | | ｳｳOverflow ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
ｳ =======M O D E S W I T C H====== >ｴｳ ﾚﾄﾄﾄﾄﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ | | | | | | | | ｳﾀ>ｴ10 Countﾃﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｴ0-9 Meterｳ
Ref<ﾄﾄﾁﾄﾂTB TB TB TB ｳ TB TB ｳ ｳ ﾀﾂﾂﾄﾄﾄﾄﾄﾄﾙ ｳProjectorｳ
ｳ ｳ ｳ ｳ ｳ ｳ ｳ ｳ ﾃﾄﾄﾄﾙｳOverflow ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
ﾚﾄﾄﾄﾄﾄﾄｿｳﾚﾄﾄﾄｿｳﾚﾄﾄﾄｿｳﾚﾄﾄﾄｿｳ ｳﾚﾄﾄﾄｿｳﾚﾄﾄﾄｿｳ ｳ ｳ ｳ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ100kHzﾃﾁｴ�10ﾃﾁｴ�10ﾃﾁｴ�10ﾃﾙ ﾀｴ�10ﾃﾁｴ�10ﾃﾙ ｳ ｳ ﾀ>ｴ100 Countﾃﾄﾄﾄﾄﾄｴ0-9 Meterｳ
ｳ Osc ｳ ｳ10kｳ ｳ 1kｳ ｳ100ｳ ｳ10 ｳ ｳ1Hzｳ ｳ ｳ ﾀﾂﾂﾄﾄﾄﾄﾄﾄﾄﾙ ｳProjectorｳ
ﾀﾄﾄﾄﾄﾄﾄﾙ ﾀﾄﾄﾄﾙ ﾀﾄﾄﾄﾙ ﾀﾄﾄﾄﾙ ﾀﾄﾄﾄﾙ ﾀﾄﾄﾄﾙ ｳ ﾃﾄﾄﾄﾄﾄﾄﾄﾙｳOverflow ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
Time Base TB Time/Prescaller ｳ ｳ ｳ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ ｳ ｳ ﾀ>ｴ1000 Countﾃｴ0-9 Meterｳ
ｳDisplay Hold Timerﾃ>ﾙ ｳResets ﾀﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙｳProjectorｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
HOW IT WORKS
The large MODE SWITCH can rearrange the units to COUNT continuously, Gated with
a TimeBase for FREQUENCY, or count a TimeBase gated with the input for PERIODS.
The display timer (Manual or about 2 seconds) starts the process off, clears
down the counters & enables the timer gate.
Each counter & divider circuit uses 8 transistor in 4 bistables as binary
ripple counters they are wired to reset @ 10 & overflow to the next counter or
divider.
Each display digit consists of a meter with 0-9 number shadow mask & lamp. The
DC drive for these uses 4 resistor (72k 36k 18k & 9k) from each binary stage of
the BCD counter output, such that the meter current represents the number 0-9.
_ Continiously
ｳ ﾀｿ_ Counting
ﾀｿ_ Signal 1 digit, 10x slower for 2nd
ﾀｿ_ 100x slower for 3rd
ﾀｿ_ｳ 1000x slower for 4th.
External presets are used to calibrate scale & zero each meter (0 & 9 test
buttons provided).
For PERIOD measurement, it rewires the units, to counts the 100kHz & uses the
last 2 �10s fed from the input frequency, to give of the input gates of 1x 10x
or 100x that period. This results in measurements of 10x 1x 0.1x in uS.
PSU
This is -7.5V for the electronics & a raw -10V regulated for the 4 lamps.
IN USE
Despite being very old it still all works & is very easy to read. The 4 digit
readout might seem to be a limitation, but overflow counting is possible. So to
measure say 1.250895MHz you 1st read the 1250kHz & then alter the range to see
the 0895Hz.
For low frequencies like CTCSS tones, where 1/10 of Hz resolution is needed,
then Period measurement & a calculator comes into its own.
See other tech buls "Watson 'Hunter' Counter Mods", "PIC Freq Counter Mods",
"Marconi Counter Type 2434A", "198kHz Off Air Standard", "Off Air Lock for Ref
Osc." & "Calibrating Frequency".
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
前のメール | 次のメール