| 摘要 |
PURPOSE: An AD/DA converter is provided, which is constructed in a manner that weak current flowing through the printer port of a PC can drive an AD converter to realize a small-sized AD/DA converter and which collects and processes only effective data to automatize and control experimental apparatus. CONSTITUTION: An AD/DA converter is constructed in such a manner that a printer port(2), a DC power jack(3) and a communication buffer(4) are placed at the front part of a substrate(1') inside a body(1), and a detection diode(5), a module resistor(6), a rectifying diode(7) and a light emitting diode(8) are set at the front, back, left and right of the communication buffer. Transistors(9,14), a constant-voltage IC(10), an electrolytic condenser(11), a DA converter(12) and an OP AMP(13) are located at the left, right and front of the detection diode. A variable resistor(15), a first AD converter(16) and a second AD converter(17) are placed at the front of the OP AMP in a row, and an oscillator(18), a precise constant-voltage IC(10') and a PC connection jack(19) are formed at the left, right and side of the AD converters.
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