Hi everyone! This is my first thread on this forum.
I'm planning to build an amplifier to drive a pair of 8-ohm, 15-watt speakers I have. They're reasonably priced but capable of delivering decent sound quality.
I've decided to use a couple of LM1875T-based amplifier modules for the power amp section. These modules require a dual-rail power supply. I'm sure many of you are already familiar with them, so I won't go into further detail about the modules.
I'm considering two options to power them: either connecting two 24V SMPS modules in the following configuration,
or using a toroidal transformer with a full-bridge rectifier and some smoothing capacitors
(I'll check if they're completely isolated from the mains supply before connecting the pair in this manner, to avoid any possible short circuits )
I've read in several places that SMPS units tend to introduce harmonics into the power line and generally deliver lower-quality power compared to toroidal transformers. Is there any truth to this statement? I know these amplifier modules are not of premium quality, but I'm eager to improve them in every way possible. I’d greatly appreciate your valuable advice.
Additionally, how much current are we likely to deal with here? The modules are rated for a 20W output each, but I understand they will waste a considerable amount of energy as heat
I'm planning to build an amplifier to drive a pair of 8-ohm, 15-watt speakers I have. They're reasonably priced but capable of delivering decent sound quality.
I've decided to use a couple of LM1875T-based amplifier modules for the power amp section. These modules require a dual-rail power supply. I'm sure many of you are already familiar with them, so I won't go into further detail about the modules.
I'm considering two options to power them: either connecting two 24V SMPS modules in the following configuration,
or using a toroidal transformer with a full-bridge rectifier and some smoothing capacitors
(I'll check if they're completely isolated from the mains supply before connecting the pair in this manner, to avoid any possible short circuits )
I've read in several places that SMPS units tend to introduce harmonics into the power line and generally deliver lower-quality power compared to toroidal transformers. Is there any truth to this statement? I know these amplifier modules are not of premium quality, but I'm eager to improve them in every way possible. I’d greatly appreciate your valuable advice.
Additionally, how much current are we likely to deal with here? The modules are rated for a 20W output each, but I understand they will waste a considerable amount of energy as heat