Why don't you check the official manufacturer's website? Its a simple search only, here: Texas Instruments: LM1875. Its still a Class AB amplifier like the original TDA2030 (and not Class B), and even looking at the datasheet sample application schematic already very indicative of the design of this power amplifier I.C. There is no difference between those two I.Cs there, as they are practically the same device. The "NOPB" simply means "no Pb" or lead free. Since its in TO-220 format (about the same as the original pentawatt format), you may need to bend the pins to accomodate the original pin postions on the board. As for finding them in Pasar Road, you may have to search high and low though as these may not be easy to find (or may not be available there)...

Most speakers have an internal crossover network circuit (usually high pass and low pass filters) that splits the amplified audio signal into different frequency spectrums for each driver (namely the woofer, midrange and/or tweeter). Furthermore most speakers usually have a pair of wires (two wires per speaker), that includes your Ego 3nity satellites (just that the single cable has actually two wire cores inside). All electrical devices such as speaker requires a return GND or a negative rail, thus minimum is always two wires per electrical connection.

For the first issue, Ive went to jalan landak, in front of pudu plaza. Finally found and bought 3 TDU2030A from this shop Online Component Sdn Bhd. They still got a few stock left.

As for the one about the speaker, I'll look into them. But usually the filters are located inside the woofer right?

Thinking of assembling a cmoy amp of my own. Already got a few Altoids cases. Should I go with the JDS cmoyBB 2.03 model or something else?

Two person at the Penang Maker Faire 2014 hv a booth to showcase this and collect names to do a factory PCB for this valve amp...





I just put down my name/e-mail for fun ...

Two person at the Penang Maker Faire 2014 hv a booth to showcase this and collect names to do a factory PCB for this valve amp...





I just put down my name/e-mail for fun ...

Bought the board from the net, plug in transformer, changed 6.3mm socket, DIP8 socket and change OPAMP from NE5534 to LME49710, hook up line in, good to go.

love the PCB god color silkscreen. what's the toroidal tranny rating?
the opamp LME49710 is a stereo opamp, why need 2 bijik?

oh..sorry my bad. yes, it's a single opamp inside this soic.
anyway, where did you get it? and how much for the pcb set?

i have this tripath TA2024 class-T amp. looking for a nice pre-amp.
since i am using a smps 12v/4A for this amp, it's best if the pre also share the supply.
any recommend? CKD version also ok.   i can DIY my self.

you have a pot in front already.

Just get a stepped attenuator for the upgrade (passive pre-amp, although the word "amp" is pointless in this context)

Save the money you'd spend on preamp for upgrades later.