hi,
i want to put together my first diy stereo amp and have these two options:
1. LM1875: QKits Electronic Kits: QK50, 25W Mono Amplifer Kit
2. a discrete 35W amp: QKits Electronic Kits: FK659, 35 Watt Stereo Power Amplifier Kit R1%
the power supply will be simple fully rectified dual unregulated with between 10K uF to 20K uF per channel.
Speaker for now is a single 8 ohm 8 inch crossover-free driver per channel. im happy with 25W per channel.
if this project goes smoothly, it will probably get upgraded to a bi-amped system with 4 identical amp blocks and this crossover: Linkwitz-Riley Electronic Crossover (the speaker will be polk audio rtia1 with crossovers removed)
Can someone please let me know the answers to these questions:
1. since i happen to have one, can i use a 35V center tapped transformer for kit 2? what kind of wattage should i expect per channel if this transformer can be used?
2. should i use an opamp buffer for the input stage? source is going to be a line level signal.
3. most importantly: given the above, which of these amps will sound better? im hoping for a low noise floor, clean mids and highs, and generally low strain at moderate volumes during prolonged use.
4. are these speaker protection units good enough: QKits Electronic Kits: FK650, Speaker Protector Kit (Stereo) (low pass filter threshold for the high-frequency channels will be changed if i upgrade to a bi-amp)
5. how will a stereo of bi-amp version sound compared to say a rotel, NAD 3125, etc?
5. finally, where can i read more about how to lay out an amp chassis to minimize noise?
Thanks a tonne!
i want to put together my first diy stereo amp and have these two options:
1. LM1875: QKits Electronic Kits: QK50, 25W Mono Amplifer Kit
2. a discrete 35W amp: QKits Electronic Kits: FK659, 35 Watt Stereo Power Amplifier Kit R1%
the power supply will be simple fully rectified dual unregulated with between 10K uF to 20K uF per channel.
Speaker for now is a single 8 ohm 8 inch crossover-free driver per channel. im happy with 25W per channel.
if this project goes smoothly, it will probably get upgraded to a bi-amped system with 4 identical amp blocks and this crossover: Linkwitz-Riley Electronic Crossover (the speaker will be polk audio rtia1 with crossovers removed)
Can someone please let me know the answers to these questions:
1. since i happen to have one, can i use a 35V center tapped transformer for kit 2? what kind of wattage should i expect per channel if this transformer can be used?
2. should i use an opamp buffer for the input stage? source is going to be a line level signal.
3. most importantly: given the above, which of these amps will sound better? im hoping for a low noise floor, clean mids and highs, and generally low strain at moderate volumes during prolonged use.
4. are these speaker protection units good enough: QKits Electronic Kits: FK650, Speaker Protector Kit (Stereo) (low pass filter threshold for the high-frequency channels will be changed if i upgrade to a bi-amp)
5. how will a stereo of bi-amp version sound compared to say a rotel, NAD 3125, etc?
5. finally, where can i read more about how to lay out an amp chassis to minimize noise?
Thanks a tonne!