8. Using a Potentiostat as HiFi - Amplifier
Last but not least a fine idea how to use the potentiostat as an excellent
High - Fidelity amplifier. Extreme low noise (20 to 30 µV) and
extreme low distortion due to the high slew rate which rarely are
obtained from usual HiFi amplifiers will give you a new sensation. If you
have a potentiostat which is able to deliver 2 A or more (e.g. our power
potentiostats from the HP or STP series), you can use it according to the
scheme shown below. The power of the speakers should be in excess of
the power of the potentiostat.
The capacitor couple in the CE line to the speaker may be cancelled if
you are sure that from the signal source no DC is introduced (may be checked
with a voltmeter at the CE terminal). If not more than some few
millivolts DC are fed through, the sound is best when no protection
capacitor is used.
Fig. 6: Potentiostat as HiFi - amplifier
The proper values for R1 and R2 are listed in the table below, calculated
for 8 Ohms resistance of the speaker. The currents are the max. currents
of the potentiostat. The voltage is calculated to give best results at
max. power without distortions. The potentiometer (20 to 50 kOhms) acts
as volume control.
| Current |
Voltage |
R1 |
R2 |
Power |
| 2 A |
16 V |
15 kOhm |
1 kOhm |
32 W |
| 3 A |
24 V |
24 kOhm |
72 W |
| 5 A |
40 V |
39 kOhm |
200 W |