Download Introduction to preamplifier

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