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Interface
Card
Realization
Of the Interface Card
For
obtaining the required voltages for each channel we begin to
generate these voltages from computer but we want to generate
these voltages simultaneously for the four channels so we use
the parallel port [1] with its data and control lines
and because
the output data from the parallel port [1] is in digital form
so we use digital to analog
converter DAC[2] but there is a problem that we want to
produce the required channels voltage at the same time but
using only DAC[2] will not solve the problem so we use
latches[3].
Each channel has its own latch and DAC.
- The
practical components used:
- Parallel
port DIP25/f (centronic)
- Buffer
74ls125[4]
- Inverter7404[5]
- DAC0808[2]
- Latch74l2373[3]
- Op-Amp
lf351[6]
- Regulators[7]
- 7805
- 7810
- 7815
- 7915
- Switches
6 terminal.
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