BWRX said:
And no doubt a bloody great big magnifying glass.
What's the component count on these amps?
If you have 20/20 vision and good lighting you shouldn't have any problems. Put down some white paper and don't breathe heavily (definitely don't sneeze!) while the parts are out 🙂 Oh watch where you lay your arms down too. Parts can stick to you and fall off anywhere they please, and once they fall on the floor they are very hard to distinguish from large dust particles (or small dust particles depending on the cleanliness of your dwelling)!
There are a total of 35 parts per board. So you'll have to solder 29 surface mount parts and 6 through hole parts per board. As you probably guessed you'll have to do this twice since there are two boards per stereo kit
The smallest parts are 0805 size and the 7720 chip is an SO8 package.
There are a total of 35 parts per board. So you'll have to solder 29 surface mount parts and 6 through hole parts per board. As you probably guessed you'll have to do this twice since there are two boards per stereo kit
The smallest parts are 0805 size and the 7720 chip is an SO8 package.
In my case its more like 18.5/19 vision, smokers cough, and the hands of a surgeon. Tree surgeon.
Got a light & several pairs of tweezers though.
Got a light & several pairs of tweezers though.
amp kits
Howdy Brian. Did I understand correctly that your kits were ready for an order? Thanks.
Bob
Howdy Brian. Did I understand correctly that your kits were ready for an order? Thanks.
Bob
Hi Bob. Right now I have the parts all tagged and bagged for 7 stereo kits, I'm just waiting for the PCBs to come in - they should arrive this week. One kit is unspoken for, so if you'd like it just let me know.
Kit of parts = not for me
My eyes could never stand it ... 🙁
From your earlier posts: " ... I designed the board for a split rail configuration as opposed to their single rail design that requires input and output coupling caps for the reason you mentioned and for some others as well! One being that you can easily add a preamp stage and use the split +/-12V rails to power it. ..."
Q&A:
* What does a pre-amp for this look like ... what are you using?
* Assuming tri-amp / tri-path operation = 3 split amps instead of crossovers on 3-way speakers ... where would you be putting the crossover circuits? Right at the input?
* +/- 12 VDC rails must assume = not for mobile / auto use ... unless you use a good sized DC to DC PS ... Can do? Got suggestions?
* Any chance of completly assembled boards? (For old guys like me with poor eyesight)
My eyes could never stand it ... 🙁
From your earlier posts: " ... I designed the board for a split rail configuration as opposed to their single rail design that requires input and output coupling caps for the reason you mentioned and for some others as well! One being that you can easily add a preamp stage and use the split +/-12V rails to power it. ..."
Q&A:
* What does a pre-amp for this look like ... what are you using?
* Assuming tri-amp / tri-path operation = 3 split amps instead of crossovers on 3-way speakers ... where would you be putting the crossover circuits? Right at the input?
* +/- 12 VDC rails must assume = not for mobile / auto use ... unless you use a good sized DC to DC PS ... Can do? Got suggestions?
* Any chance of completly assembled boards? (For old guys like me with poor eyesight)
Hi FastEddy.
A preamp for these modules could be as simple as an op amp buffer or as complicated as you'd like. You just have to be careful to make sure the output of this stage has a low offset because the input is DC coupled.
Currently I'm using one half of a TL072 to buffer the source and drive a 50k log pot and the other half of the TL072 to provide a high impedance input for the pot and low impedance to the input of the amp. Another TL072 does the same for the other channel. It works very well, and you can of course use any kind of op amp you'd like.
For bi or tri amping you would definitely want to use active crossovers before amplifiers. You'd want something like an op amp to buffer the source and drive the filter stages, and then simply run the output of the filter stages right into the modules.
These modules weren't intended for automotive use, as their output power puts them at a disadvantage because you usually need a fair amount of power to compete with the higher noise floor in a car. You could run them in a car if you made a +/-12V switching supply. To use a single 24V supply requires the use of input and output coupling caps and a voltage divider to set the reference voltage at half the supply voltage.
If the response is good from those who will build and listen to these, then I will see about having some assembled.
A preamp for these modules could be as simple as an op amp buffer or as complicated as you'd like. You just have to be careful to make sure the output of this stage has a low offset because the input is DC coupled.
Currently I'm using one half of a TL072 to buffer the source and drive a 50k log pot and the other half of the TL072 to provide a high impedance input for the pot and low impedance to the input of the amp. Another TL072 does the same for the other channel. It works very well, and you can of course use any kind of op amp you'd like.
For bi or tri amping you would definitely want to use active crossovers before amplifiers. You'd want something like an op amp to buffer the source and drive the filter stages, and then simply run the output of the filter stages right into the modules.
These modules weren't intended for automotive use, as their output power puts them at a disadvantage because you usually need a fair amount of power to compete with the higher noise floor in a car. You could run them in a car if you made a +/-12V switching supply. To use a single 24V supply requires the use of input and output coupling caps and a voltage divider to set the reference voltage at half the supply voltage.
If the response is good from those who will build and listen to these, then I will see about having some assembled.
Re: Kit of parts = not for me
I would happily assemble it for you! Or, I could sell my completed modules.
Mike.
FastEddy said:
* Any chance of completly assembled boards? (For old guys like me with poor eyesight)
I would happily assemble it for you! Or, I could sell my completed modules.
Mike.
Hey mike - you've replied a couple times but haven't posted any listening impressions. I was hoping you could provide your honest opinion of them - good or bad.
well that tears it ...
... when can I get an assembled amp (my eyes are not good enough to do soldering any more). ... I'll probably be using it to boost an 8 ohm sub woofer ...
Mike.m26 ... got a price list??
... when can I get an assembled amp (my eyes are not good enough to do soldering any more). ... I'll probably be using it to boost an 8 ohm sub woofer ...
Mike.m26 ... got a price list??
Re: Re: Kit of parts = not for me
Mike,
You are just over in the Big Smoke? I might take you up on that.
dave
mike.m216 said:
Mike,
You are just over in the Big Smoke? I might take you up on that.
dave
Planet10, I'm close to Vancouver.
Those interested in me assembling their modules please email me 🙂
mike'at'vortexsoundservices.com
Listening impressions.. I'm no good at posting impressions.. 🙂
To start off, I like them! they sound very neutral, no over-emphasized bass or trebble, but there's no lack of either. Their modest power output is enough when using efficient speakers. The chips don't even get warm when running at full power.. Me like. 😀
Those interested in me assembling their modules please email me 🙂
mike'at'vortexsoundservices.com
Listening impressions.. I'm no good at posting impressions.. 🙂
To start off, I like them! they sound very neutral, no over-emphasized bass or trebble, but there's no lack of either. Their modest power output is enough when using efficient speakers. The chips don't even get warm when running at full power.. Me like. 😀
No apology needed. I just assumed you were too busy listening 😉
That's very kind of you to offer your services as well. Assembly will be even faster since there won't be any toroids to wind with these kits.
That's very kind of you to offer your services as well. Assembly will be even faster since there won't be any toroids to wind with these kits.
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