What size stuffing tube for 19mm housing
03/23/2008, 10:45 pm
Default Group and Edit
after lying flat for days (some virus) it finally went up again today. When I look at the calendar, I notice that the club meeting is about to begin. Last year I decided to finally tackle a project that had been lying idle for a long time. Well the year was over quickly ...
So, enough celebrations ...
What do i have here?
Correct! Some rubbish, two beautiful boards and they house my "MultiTool2"
Here again in a close-up. Above in conventional construction, below as SMD as far as possible.
What can this part do now? See for yourself: (translation will come later)
Here are how each of the modes work at present ....
Prob - Logic Probe
The logic probe shows 'H' for high (over 3.7 volts), 'L' for low (below 0.8 volts) and '-' for floating in the first display location. If a pulse is detected (0.5 usec minimum), the second location flashes a 'P'.
PULS - logic pulser
The logic pulser shows the pulse rate (5, 50, 500, 5.0) in the last 3 locations. The first location shows the sensed logic level as a dash in the bottom or top of the digit. When button # 1 is held down, a series of 0.5 microsecond pulses are generated in the opposite direction and the center segment is lit.Pushing button # 2 cycles through the 4 pulse rates. The selected pulse rate is saved on power down.
FrEq - Frequency Counter
In the frequency counter mode, hitting button # 1 switches the display to the next 4 digits of the count. For instance, the display shows '12.57 'for a frequency of 12.576 hz. Holding down button # 1 shows '2576' - the lowest 4 digits. If a decimal point shows, the value is in Khz, if the decimal is flashing, the value is in Mhz. Hence, a frequency of 42,345,678 hz is displayed as 42.34 with a flashing decimal. Holding down button # 1 in this case will display 5678.
Cnt - Event Counter
In the event count mode, the display shows the lowest 4 digits. Button # 1 switches to the next higher 4 digits while held down. Button # 2 resets the count.
VoLt - voltmeter
The voltmeter uses the power going into the probe as a voltage reference. The current implementation shows only an approximate voltage - about 2% high. This can still be very usefull for most measurements. Do not connect the probe to voltages that exceed 5 volts under any conditions.
diod - Diode Junction Voltage
This is just the voltmeter function with 10k resitor feeding current to the probe tip. When a diode or transistor junction is connected from the tip to the ground lead, the drop voltage is displayed.
Cap - Capacitance Measurement
When a capacitor is connected from the tip to the ground lead, and button # 1 is pushed, its value is displayed. Values from .001 uf to about 500 uf are displayed. The larger the capacitor, the longer it takes to measure. A value of 100uf takes a couple of seconds.
SIG - signal generator
This mode generates a 500hz squarewave at about 0.5 volts. The signal is only generated while button # 1 is held down.
ntSC - Video Patern
Generates an NTSC video frame with a white dot pattern when button # 1 is held down.
9600 - Serial Ascii
Each time button 1 is pushed, the letters A-Z followed by cr / lf is generated. Auto polarity sensing. If the signal injection point is originally high, then normal (zero start bit) ascii is generated. Otherwise, the other polarity is done. New feature: Button # 2 cycles thru 1200, 2400, 4800, 9600 baud.
Midi - Midi note
Sends note number 60 (middle C) on any of the 16 midi channels. Holding button 1 sends 'note on'. Release of button 1 sends 'note off'. Buttton 2 cycles through the 16 channels. The midi channel number is stored.
R / C servo
Generates 1ms to 2ms pulse for r / c servos. Button 1 increases pulse, Button 2 decreases pulse. Defaults to 1.5 ms each time mode is entered.
 Sqaure Wave
Generates 1 - 9999 Hz squarewave. Button 1 decreases frequency, Button 2 increases frequency.
Prn - pseudo random number
Generates 10khz digital PRN series.
Generates 1 millisecond on and 2.5 millisecond off of 38 kHz square wave. When connected to IR LED, used for testing IR receiver modules.
Generates variable pulse width 3-97 percent of a 6khz (approx) digital signal. Button 1 decreases pulse width, Button 2 increases pulse width.
In any mode, holding down both buttons exits to the menu. Once there, releasing and pressing button # 1 cycles through its modes forward. New Feature: Button # 2 cycles thru modes backwards.
The mode is saved on power down. Since this device takes its power from the circuit being tested, powering down and back up will restore the same operating mode.
So far I've tested the following
Voltmeter (up to max. 5V approx. 1%) for checking the TTL voltage is completely sufficient
have applied from 10Hz to 45MHz (TTL level), 1A!
Timing the forward voltage quite precisely, Si, germanium, Shottky diodes can be easily distinguished from each other (especially important for the small glass jerks) LEDs can also be tested and since they are tested with 5V, even blue and white ones.
When the test tip is open, it shows 100p, from approx. 1nF up to 470µF is very accurate, but from approx. 100µF it takes a while ...
R / C servo tester
Outputs very precise pulse lengths from 0.77nS to 2.3nS.
I tested the other functions briefly, with the ntSC rumble here in "PAL-Land" next to it.
Tomorrow (if my carcass cooperates) I'll make the housing for the SMD version.
And if you are interested: I still have a few circuit boards, as well as some programmed chips
Man has three ways to act wisely.
First, by thinking: this is the noblest.
Second, by imitation: this is the easiest.
Third, through experience: this is the bitterest.
This post was edited by Guido on March 23rd, 2008 at 11:24 pm.
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