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Voltage Regulators for Line Level Audio. Part 10 : Simple Shunts

Posted 11th April 2014 at 06:59 AM by rjm
Updated 15th April 2014 at 11:52 PM by rjm

Part of a series.

I've been meaning to take up shunt regulators for some time. I've never got around to building one myself to try, so I'll have to make do by playing in simulation.

Today's circuit is the shunt analog of the Z-reg series regulator: no feedback, Zener reference, single transistor regulation. The output impedance and ripple rejection-characteristics are similar too, with about 40 dB of RR and an output impedance of just a few ohms. It can be built equivalently from either an pnp or pnp transistor. (See attached LTSpice .asc files.)

The difference between shunt and series regulation can best be explained by considering the upstream power supply: In a series regulator an increase in current demand by the load causes the regulator to increase the current to compensate. In a shunt regulator an increase in current demand by the load causes the regulator to decrease the shunt current to balance, so there is no net change in current flowing...
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Attached Files
File Type: asc voltageregulator8-npn.asc (1.5 KB, 87 views)
File Type: asc voltageregulator8-pnp.asc (1.5 KB, 88 views)
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