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Transcript
Introduction to preamplifier 1. Preamplifier in STM is a kind of current to voltage converter. Its gain can be express as follows: V Gain = out = R I in 2. Circuit diagram - Gain = 109 - 0.98 k Ohms resistor and 3 pF capacitor in the diagram are not used. 3. Parts supplied Name Bread board OP amp Resistor 1 Resistor 2 Resistor 3 Capacitor 1 Wire Coaxial cable Connectors Battery Battery connector Switch Battery Quantity 1 EA 1 EA 1 EA 1 EA 2 EA 2 EA 1 roll 1 roll 4 EA 2 EA 2 EA 1 EA 1 EA Insulating enclosure 1 EA 4. Sample picture Remarks OPA627 of TI (Texas Instrument) 1 G Ohms 200 Ohms 10 Ohms 1 µF Alpha wire 9058AC (1 m) 9V for OP amp 9V battery For 9V battery 1.5V for bias voltage Aluminum (Die casted) 110×60×26 mm3
