Shunt reg PCB, anyone familiar with this one?

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Mayday

Member
2004-03-02 10:43 pm
Sweden
Anyone here familiar with this shunt regulator?
Schematic, performance etc?
 

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Mayday

Member
2004-03-02 10:43 pm
Sweden
Those are not the same thing, that are series regulators.The thing in post #1 is a shunt regulator.Shunts consume always the maximum and the circuit to feed gets a piece of it, not very economical.Where as the series reg.only dissipates the exess from the source.
Mona

Yes, thank you.
I should have been more clear in my question.
I ment qualities like sonic performance ( if you can ascribe that to a vreg), stability and precision.

From my understanding, the above reg will have a constant draw of about 250-300mA.
Delivering about 100mA/rail to the "consumer" according to the info you provided.

Would the reg be able to provide lower voltage, say +/-5Vdc(the ebay listing for the PCB claimed a wide range of both output and input)?

Are current delivery capability in any way related to the voltage it is asked to deliver?
 

Ketje

Member
2012-12-19 7:24 pm
Flanders
With the values of the resistors used you can turn down the output to almost 7V.
The transistor on the left (schematic) will get hotter (unless you drop the input voltage too) and the other cooler.
The max. current is determend by the voltage drop on the LED together with the 10Ω resistor.And the voltage drop depends on the current in the LED trough 4k7.So if the input voltage drops the current in the LED goes down to as the voltage drop.Result is less output current.
Mona
 

Mayday

Member
2004-03-02 10:43 pm
Sweden
With the values of the resistors used you can turn down the output to almost 7V.
The transistor on the left (schematic) will get hotter (unless you drop the input voltage too) and the other cooler.
The max. current is determend by the voltage drop on the LED together with the 10Ω resistor.And the voltage drop depends on the current in the LED trough 4k7.So if the input voltage drops the current in the LED goes down to as the voltage drop.Result is less output current.
Mona

Thank you for your answers :)
I haven't really found a use for it yet, but I was getting stuff off ebay anyway, and as I wrote...I had all the parts to populate it at home already.

Might be good for powering a preamp, headamp or similar one day.
 
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