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You should get yourself a 24v power supply. You can pick variable regulated ones up for around $100
or You can make put 22v on the inverting input on an opamp and get youself -20v. Then you can power your circuit. However. Better to get a capable power supply to start with.
0-30v and 0-60 dual in same unit $120
http://elexp.com/tst_3lk2.htm
Analog display for $95
http://elexp.com/tst_003m.htm
or You can make put 22v on the inverting input on an opamp and get youself -20v. Then you can power your circuit. However. Better to get a capable power supply to start with.
0-30v and 0-60 dual in same unit $120
http://elexp.com/tst_3lk2.htm
Analog display for $95
http://elexp.com/tst_003m.htm
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