# Nichicon ES Bipolar cap location in the amplifier?

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#### rhythmsandy

Planning to use the Nichicon ES Bipolar cap in the circuit so any recommendations where to use this unique cap? Im thinking to use it at the input which is connected to the ground I mean not the DC coupling cap but the cap which connects to the feedback loop mostly 220uf/25V or so is observed but many suggest to get higher value. some say that using higher cap value at this place will give firm bass.

#### Enzo

Unless I am missing something, I think you have put the cart before the horse. In general we don;t start with a part and wonder where to use it, we usually start with a circuit and then wonder what part is best suited to each position in that circuit.

#### rhythmsandy

Unless I am missing something, I think you have put the cart before the horse. In general we don;t start with a part and wonder where to use it, we usually start with a circuit and then wonder what part is best suited to each position in that circuit.

I agree that Bipolars specifically used at very few places so is that one place where one can use them.

Lets consider this circuit I think C7 capacitor but how much Capacitance and Voltage is considered best.
http://2.bp.blogspot.com/-Ar5kyL_zv...8/dLmq3oabosA/s1600/Nnmos350-500schematic.png

#### rhythmsandy

I agree that we can calculate the rolloff freq but with larger value once i read that it will result in firm bass.

#### DF96

I would like to put a short length of fence in my garden. Where would you suggest I put it?

#### holmesc

C7 is the only position that makes sense in this circuit so put it there.

#### John C

I would like to put a short length of fence in my garden. Where would you suggest I put it?

Next to that Green flat thing...

#### rhythmsandy

C7 is the only position that makes sense in this circuit so put it there.
Even I feel the same the only cap but what value is preferred. Yes the rolloff can be calculated and will go as low as possible to even 1Hz but I read somewhere that using higher value cap like 470uF or 1000uF will give firm bass is it true?

#### holmesc

The schematic you linked is Quasi's NMOS amplifier, a tried and tested design. The 1k feedback ground resistor in series with the original 100u yields ~1.6 Hz Fc. This is already sufficient not to influence the frequency response.

A rule of thumb when using electrolytic coupling capacitors is to set the turnover point one to two decades below the audible frequency range (20Hz) to eliminate capacitor distortion. The original values satisfy that criterion. You could opt for a bigger cap but I doubt you'll hear much difference if any.

Some of the quasi designs I've played with (never this one) have what I might call a slightly "bloated" bass (possibly caused by higher levels of second order harmonics?). If you want "firmer" bass maybe try something with a full complementary output stage.

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