Labels:text | diagram | technical drawing | plan | screenshot | font | black and white | parallel OCR: 330 OHM (54-94) 100 OHM (34-5V) 330 OHM 100 OHM (54-90) (3V-5V) >(-) PROBE >(+) PROBE LED LED >(+) PROBE + >(-) PROBE LOGIC PROBE 3V-9V CONTINUITY TESTER CATHODE (-) PROBE CATHODE (+) PROBE (+) PROBE ANODE 330 OHM RESISTOR (5V-9V) 100 0HM RESISTOR (34-5V) 330 OHM RESISTOR (5V-9V) Light Emitting Diode LED 100 OHM RESISTOR (34-5V) ANODE (-) PROBE LOGIC PROBE TO USE THE LOGIC PROBE CONNECT THE (-> PROBE TO GOUND AND THE (+) PROBE TO THE POINT THAT YOU WANT TO KNOW THE LEVEL OF. IF THE LED LED LIGHTS UP THEN THE LEVEL IS HIGH IF THE LED STAYS OFF THE THE LEVEL Light Emitting Diode IS LOW. THE PROBE IS MAINLY USED TO CHECK FOR THE PRESENCE +5V. CONTINUITY TESTER TO USE THE CONTINUITY TESTER, SIMPLY PLACE ONE POBE ON EACH END OF A TRACE OR LINE THAT YOU WANT TO CHECK. IF THE LED LIGHTS THEN THERE IS A CONNECTION BETWEEN THE TWO POINTS. 3-9 Volts IF THERE IS SUPPOSED TO BE A CONNECTION THEN Battery IT CHECKS OUT OKAY. IF THERE IS NOT SUPPOSED To put these simple testing aids together obtain the parts shown TO BE A CONNECTION THEN THE TWO LINES ARE SHORTED TOGETHER. in the diagrams. You can use a single LED and resistor for both the logic probe and the continuity tester. These parts can be obtained from any local electronics store such as Radio Shack. The battery can be any battery that produces between 3 and 9 volts. THE THO MEG AGNUS PROJECT A 9 volt transistor radio battery works fine for this. When using an LED always make sure that you have a resistor in line with it as shown in the diagram. DRAWN BY: TITLE: If you do use a 9V battery do not use the probe on the board when THE TWO MEG AGNUS PROJECT NEIL COITO TESTING PROBES you have ICs installed or when the board is installed in the computer. If you need to use the probe under these conditions use a voltage below 5V, preferably 3V. This is so you do not damage DATE: 10-15-91 SHEET 1 OF 4 any of the ICs. If you use 3V then replace the resistor with a SCALE: NONE SIZE: DRAWING: 100 ohm value. REVISION: 1.0 TTMAP50D_PROBES COPYRIGHT 1992-93 STRUCTURED APPLICATIONS & DESIGNS, INC.
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