Good day ladies and gentlemen o/
I have recently started to plan my new project for a mobile speaker i want to build from scratch and i could really need your help regarding OP-AMPs and detailed speaker information/clarification.
I do not want to buy a finished Amplifier board. I'm interested in learning that stuff and building something i can be proud of.
What i have planned and other information you possibly need:
- Size should be roughly 15x8x8(cm) / ~6x3x3(inch) (so roughly like the Bose Soundlink Mini II)
- 3.5mm audio signal Input(phone, mp3 player)
- 2 way Stereo
- Should run on rechargable Li-Ion Battery pack(s) with a minimum playtime of 4-6h on full volume.
- highest possible audio quality and power efficiency
- price can be up to 200 USD as i prefer having a good result i can be proud of.
What i need/know so far(correct me if im wrong):
- 2x 5V Batteries for +Vs and -Vs with ground in between for OP-AMP supply
- 1-2 OP AMPS(depends what type)
- Low/High-pass filters
- 3.5mm Socket
- PCB + passive components
- Drivers(4 ohms) if i'm going with +-5v
Whats still unclear or needs confirmation:
- What type of OP-AMP should i use. by going through this forums i found out the OPA2134 seems to be good. As far as i know this one cannot be used for stereo(unless i use 2) or rather a OPA1679 for stereo use?
- What supply voltage should i use for the OP-AMPs? Will +5V and -5V be enough?
- I have created a small circuit just for testing the OP-AMP and the voltage/current i need. With a +5V/-5V OP-AMP and a 4 Ohms driver i only end up with 6.25 Watts on the driver. Will that be enough? almost seems like it for me..
- Just to clarify: If i supply my OP-AMP with the required power source, it will also forward enough current to the driver, correct? or do i need to support the driver seperately?
This is my first - very simple - test for the 4 ohms driver:
with a max Voltage of 500mv given by the audio signal source and an OP-AMP Supply of +-5V i reach 6.25W with a Current of 1.25A at 5V The driver im currently thinking of is capable of handling up to 25W.
If this project works out - i will post some pictures and details
I'm very grateful for all the help i'm getting from you as this is my first bigger project
I have recently started to plan my new project for a mobile speaker i want to build from scratch and i could really need your help regarding OP-AMPs and detailed speaker information/clarification.
I do not want to buy a finished Amplifier board. I'm interested in learning that stuff and building something i can be proud of.
What i have planned and other information you possibly need:
- Size should be roughly 15x8x8(cm) / ~6x3x3(inch) (so roughly like the Bose Soundlink Mini II)
- 3.5mm audio signal Input(phone, mp3 player)
- 2 way Stereo
- Should run on rechargable Li-Ion Battery pack(s) with a minimum playtime of 4-6h on full volume.
- highest possible audio quality and power efficiency
- price can be up to 200 USD as i prefer having a good result i can be proud of.
What i need/know so far(correct me if im wrong):
- 2x 5V Batteries for +Vs and -Vs with ground in between for OP-AMP supply
- 1-2 OP AMPS(depends what type)
- Low/High-pass filters
- 3.5mm Socket
- PCB + passive components
- Drivers(4 ohms) if i'm going with +-5v
Whats still unclear or needs confirmation:
- What type of OP-AMP should i use. by going through this forums i found out the OPA2134 seems to be good. As far as i know this one cannot be used for stereo(unless i use 2) or rather a OPA1679 for stereo use?
- What supply voltage should i use for the OP-AMPs? Will +5V and -5V be enough?
- I have created a small circuit just for testing the OP-AMP and the voltage/current i need. With a +5V/-5V OP-AMP and a 4 Ohms driver i only end up with 6.25 Watts on the driver. Will that be enough? almost seems like it for me..
- Just to clarify: If i supply my OP-AMP with the required power source, it will also forward enough current to the driver, correct? or do i need to support the driver seperately?
This is my first - very simple - test for the 4 ohms driver:
with a max Voltage of 500mv given by the audio signal source and an OP-AMP Supply of +-5V i reach 6.25W with a Current of 1.25A at 5V The driver im currently thinking of is capable of handling up to 25W.
If this project works out - i will post some pictures and details
I'm very grateful for all the help i'm getting from you as this is my first bigger project