Showing posts with label negative. Show all posts
Showing posts with label negative. Show all posts
Tuesday, September 9, 2014
Positive to Negative Voltage Inverter
This simpe schema will convert the positive input voltage become negative voltage.
Schematic diagram:
Component list:
Notes:
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Schematic diagram:
Component list:
| Part | Total Qty. | Description | |
| R1 | 1 | 24K 1/4 Watt Resistor | |
| R2 | 1 | 56K 1/4 Watt Resistor | |
| C1 | 1 | 3300pF 25V Ceramic Capacitor | |
| C2 | 1 | 47uF 25V Electrolytic Capacitor | |
| C3 | 1 | 10uF 25V Electrolytic Capacitor | |
| D1, D2 | 2 | 1N4148 Silicon Diode | |
| U1 | 1 | 555 Timer | |
| MISC | 1 | Wire, Board |
Notes:
- V+ can be anywhere from 4 to 16V. -V is one volt less than V+. So for -12V output, use +13V input. The maximum current output of the schema is about 280mA, more than enough for a few op amps.
- For better regulation, a 79LOxx series regulator can be used.
- A zener diode may also be used to regulate the output voltage.
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