Hi there,
I posted here before and everyone was very helpful, I'm hoping I can get some assistance again!
I have a voltage regulator circuit with an LM338k it is powering a D-Class amp:
It works great except when I turn it on a get a bit of annoying popping in the speakers. I was thinking converting the circuit to a slow start could help smooth this out a little and put less strain on the amp. (I have also added a mute switch to the amp which works but I'd rather not have to use it every time).
The data sheet for the LM338 has a brief example of a circuit with slow start using a PNP transistor.
I am just not too sure about correct component values for my intended output (the example is for 15v regulation, and I can't see anything else in the datasheet explaining the circuit). I can see where most of my components would fit in. Obviously R1 and R2 would remain the same - setting the output voltage, and I imagine the protection diodes could remain in place.. but how do i determined the value for R3? and is the input cap separate to the ripple smoothing cap in my original circuit? (0.1uf is drastically different to 4700uf...) Would my C3 cap translate to the C1 cap in this schem?
Any help would be very much appreciated!
Thank you!
I posted here before and everyone was very helpful, I'm hoping I can get some assistance again!
I have a voltage regulator circuit with an LM338k it is powering a D-Class amp:
It works great except when I turn it on a get a bit of annoying popping in the speakers. I was thinking converting the circuit to a slow start could help smooth this out a little and put less strain on the amp. (I have also added a mute switch to the amp which works but I'd rather not have to use it every time).
The data sheet for the LM338 has a brief example of a circuit with slow start using a PNP transistor.
I am just not too sure about correct component values for my intended output (the example is for 15v regulation, and I can't see anything else in the datasheet explaining the circuit). I can see where most of my components would fit in. Obviously R1 and R2 would remain the same - setting the output voltage, and I imagine the protection diodes could remain in place.. but how do i determined the value for R3? and is the input cap separate to the ripple smoothing cap in my original circuit? (0.1uf is drastically different to 4700uf...) Would my C3 cap translate to the C1 cap in this schem?
Any help would be very much appreciated!
Thank you!