| Electronics > Beginners |
| Virtual ground push-pull |
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| oliver602:
Hi, Im trying to make a split supply for a diy function generator kit I got from banggood.com. it needs +12 -12v +5 and Gnd. Im using a boost converter module to step up a battery to 24V and plan to make a virtual ground and the +5v using 2 opamps. I've been simulating the circuit in EveryCircuit. I tried adding a push-pull setup on the virtual ground opamp to increase maximum current and now the simulation will not run. Anybody like to point me in the right direction? Any tips on buffering the output of the ground opamp in this circuit? http://everycircuit.com/circuit/4693683140820992 |
| MarkF:
Maybe something like this |
| oliver602:
Interesting! What does R4 on the opamp output do? |
| MarkF:
The op-amp in is providing the virtual ground. However, it's output current is not very large. The transistors are used to boost the op-amp output current. The resistor, R4, determines how much boost current is provided. |
| floobydust:
R4 also helps with cross-over switching distortion when a load varies from source to sink and back. With the op-amp's output at say 1/2Vcc plus 0.2V neither transistor would be on. You can get it in an IC TLE2426 The 'Rail Splitter' Precision Virtual Ground. |
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