Hello,
I would greatly appreciate some help or advice determining the size of inductor L1. (see schematic)
This schematic is for a Bryston 3B-SST amplifier, main board. This is what the BOM listed for L1: enameled wire, 1.6-1.8mm. I contacted the seller for more information and they provided me with these specifications. (see image)
From the information provided I believe I could make the inductor (have never made one before) or is there a way to determine the inductance to buy an off the shelf inductor?
I’ve done some research on making an inductor coil and it doesn’t look too be to difficult.
So, should I make it? And if so, is there anything they left out, from your experience, that would prevent me from making a suitable inductor?
Thank you for your time, Mark
I would greatly appreciate some help or advice determining the size of inductor L1. (see schematic)
This schematic is for a Bryston 3B-SST amplifier, main board. This is what the BOM listed for L1: enameled wire, 1.6-1.8mm. I contacted the seller for more information and they provided me with these specifications. (see image)
From the information provided I believe I could make the inductor (have never made one before) or is there a way to determine the inductance to buy an off the shelf inductor?
I’ve done some research on making an inductor coil and it doesn’t look too be to difficult.
So, should I make it? And if so, is there anything they left out, from your experience, that would prevent me from making a suitable inductor?
Thank you for your time, Mark
Attachments
The Zobel inductor value is not as critical as some. You seem to have enough information there to do it yourself.
Wrapping the wire around a bolt with suitable diameter and thread pitch is an easy way.
To measure the inductance, use a DMM with an inductance range.
To measure the inductance, use a DMM with an inductance range.
Arguably the Zobel network doesn't have an inductor, its simply a series RC that hides inductance from the amplifier output. Though you could view the whole output network as a Zobel network that hides the cable capacitance and speaker inductance from the output.
Technically Zobel networks are usually cancelling reactive impedance in the load and are tuned specifically to the load. For an audio amp the load can vary a lot in its reactive components, so its probably better to think of the output network as a crude approximation, with an inductor to limit capacitive reactance and an RC Zobel to cancel that inductance enough that the amplifier sees a mainly resistive load at high frequencies.
If the overall network is sufficient you should be able to drive a large capacitive load, or inductive load, without the amplifier oscillating. So the network is really defined by the source behaviour, not the load, which is not the normal use of the term Zobel.
