hi friends,
I have a doubt regarding Zobel networks. I am not an expert and the maximum knowledge that I have about Zobel networks is that they are used to protect the amplifier from bad oscillations that can arise out from the inductive component of the loudspeaker driver . In most projects, I have seen that most designers use a RC Zobel network parallel to the output (Like the P3A, P68, Apex F100) without any LR type of zobel.
I am from India and here, people just put an LR Zobel networks for almost all designs (from 80/100 watts) or at least a coil for the TDA7294. Even if I give them an amplifier board with RC Zobel, some guys are stubborn on putting an LR Zobel even if they themselves don't know its real purpose. These amps don't have long speaker leads.
I don't understand whether this LR type zobel have an additional safety margin or whether they have additional superiority to the RC combination as in P3A/Apex designs.
I am planning to design a 5 channel TDA7294 board for myself and I thought it would be wise to get clarified on this since I have seen one board in my local shop with a simple coil before each output for their 5 channel board.
I have a doubt regarding Zobel networks. I am not an expert and the maximum knowledge that I have about Zobel networks is that they are used to protect the amplifier from bad oscillations that can arise out from the inductive component of the loudspeaker driver . In most projects, I have seen that most designers use a RC Zobel network parallel to the output (Like the P3A, P68, Apex F100) without any LR type of zobel.
I am from India and here, people just put an LR Zobel networks for almost all designs (from 80/100 watts) or at least a coil for the TDA7294. Even if I give them an amplifier board with RC Zobel, some guys are stubborn on putting an LR Zobel even if they themselves don't know its real purpose. These amps don't have long speaker leads.
I don't understand whether this LR type zobel have an additional safety margin or whether they have additional superiority to the RC combination as in P3A/Apex designs.
I am planning to design a 5 channel TDA7294 board for myself and I thought it would be wise to get clarified on this since I have seen one board in my local shop with a simple coil before each output for their 5 channel board.
A Zobel network is one which corrects a given impedance toward making it appear resistive, whatever that takes. This could be for any purpose eg.
1. In an amplifier at the output the purpose is higher frequency stability, and it is recommended. In any case it's out of band and easy enough to do.
2. In parallel with a speaker driver, or sometimes part way into a crossover, to flatten the impedance for convenience making the crossover easier to adjust, or easier to calculate with standard formulas.
3. Between the amp and crossover (in band) to give the amp an easier load. This is not often used.
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