Use solder paste for these parts - the bottom pad is the thermal pad to conduct to the PCB. Heat the PCB with paste and part on a hot plate skillet or use a hot air gun from above.
Ideally it should be soldered on the thermal pad to the bias below for optimal performance as this chip can dissipate significant power when operated from +/-15v rails and if asked to drive low impedance loads (600ohms). The data sheet says that it can be left isolated or connected to Vee. Thermal paste dab might work ok, but I can’t say how robust the operation will be. The chip does get hot.
You can order the paste in a $10 syringe and apply a dab of it and heat with an iron from below even. But a hot skillet like used for cooking can certainly be used to solder parts like this easily and is much better than hand soldering with an iron.
If you do a search on YouTube of “SMT soldering hot plate” you will see how easy it is.
Or you can order the prepopulated SMT boards.
Datasheet for LME74924:
https://www.ti.com/lit/ds/snas438a/...https%3A%2F%2Fwww.ti.com%2Fproduct%2FLME49724
You can order the paste in a $10 syringe and apply a dab of it and heat with an iron from below even. But a hot skillet like used for cooking can certainly be used to solder parts like this easily and is much better than hand soldering with an iron.
If you do a search on YouTube of “SMT soldering hot plate” you will see how easy it is.
Or you can order the prepopulated SMT boards.
Datasheet for LME74924:
https://www.ti.com/lit/ds/snas438a/...https%3A%2F%2Fwww.ti.com%2Fproduct%2FLME49724
When soldered correctly, is the space under the chip full of solder or look the same as a new board?
Nice build jrosser! I also power my BTSB from an off board psu. I’m currently using mine as a buffer w/gain after an AD1862 Dac passive I/V.
Attachments
Please create a YouTube Tutorial
Please create a YouTube Tutorial soldering the SMD parts on TH and SMD board.
Please create a YouTube Tutorial soldering the SMD parts on TH and SMD board.
To do it using a conventional iron and solder (not so neat and time consuming):
Collin's Lab - Surface Mount Soldering - YouTube
To do it using solder paste and a hot air pencil (neat and fast):
SMD soldering by hot air (solder paste) - YouTube
You can also place on an old Teflon skillet or fry pan on a dormitory cook plate:
There is good tutorial here by Sparkfun
Reflow Skillet - SparkFun Electronics
Recently I see people are using a layer of sand on the bottom of the fry pan to make the heat very even. I have not found this to be necessary and feel that sand might contaminate the PCB. But it would make the heat a lot less damaging if you did not monitor the temps carefully with an IR thermometer.
Solder SMDs With A Pan O’ Sand | Hackaday
Basic steps for hot air here:
Surface mount soldering for the first time, using a hot air rework station - YouTube
Some of my tips here:
Soldering SMD components
Binocular magnifiers and good high quality tweezers are very important. Invest $20 in a pair of Swiss made tweezers. They are an extension of your fingers and good ones give you the control and precision needed. $4 ones can work too but eventually, you will find them to either bend, break, or not be precise enough.
Collin's Lab - Surface Mount Soldering - YouTube
To do it using solder paste and a hot air pencil (neat and fast):
SMD soldering by hot air (solder paste) - YouTube
You can also place on an old Teflon skillet or fry pan on a dormitory cook plate:
There is good tutorial here by Sparkfun
Reflow Skillet - SparkFun Electronics
Recently I see people are using a layer of sand on the bottom of the fry pan to make the heat very even. I have not found this to be necessary and feel that sand might contaminate the PCB. But it would make the heat a lot less damaging if you did not monitor the temps carefully with an IR thermometer.
Solder SMDs With A Pan O’ Sand | Hackaday
Basic steps for hot air here:
Surface mount soldering for the first time, using a hot air rework station - YouTube
Some of my tips here:
Soldering SMD components
Binocular magnifiers and good high quality tweezers are very important. Invest $20 in a pair of Swiss made tweezers. They are an extension of your fingers and good ones give you the control and precision needed. $4 ones can work too but eventually, you will find them to either bend, break, or not be precise enough.
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I've asked about integrating circuits based on CS3310 above, seems putting everything in one box gets dicey re power supplies, EMI. . .
Here's an example, also includes 4-way input switcher and a remote
Remote XLR balance preamplifier CS3310 Balanced volume controller L14-59 | eBay
keywords Audio Volume Controller Preamp CS3310
For example:
TXINLEI 858D 110V Solder Station, Digital Display SMD Hot Air Rework Station Solder Iron Kit Heat Gun, Tweezers, Desoldering Pump https://www.amazon.com/dp/B07FBGFT3K/ref=cm_sw_r_cp_api_fabc_niUYFbTHHFDW0?_encoding=UTF8&psc=1
This is my go to tweezers. I have had them for 22 years and still use them almost everyday:
Techni-Tool 00-SA Strong Sharp Precision Swiss Tweezer 00 | JENSEN Tools + Supply
NTE Electronics SW02-25 No-Clean Solder Wick, 4 Blue.098" Width, 25' Length https://www.amazon.com/dp/B0195UMPDK/ref=cm_sw_r_cp_api_fabc_ElUYFbYQWXMR8?_encoding=UTF8&psc=1
Kester 959T Soldering Flux 2oz... https://www.amazon.com/dp/B01N11M60P?ref=ppx_pop_mob_ap_share
Solder Paste Sn42/Bi57.6/Ag0.4 No-Clean Lead-Free Low Temperature Melts 138C 281F https://www.amazon.com/dp/B0195V1QEI/ref=cm_sw_r_cp_api_fabc_0oUYFbRREKXD2?_encoding=UTF8&psc=1
22 Ga 1.24 Inch Blunt Plastic Tapered Tip Dispensing Fill Needle,Precision Filling (Blue,20 Pcs) https://www.amazon.com/dp/B07RX5QCVZ/ref=cm_sw_r_cp_api_fabc_BrUYFbG6C825D?_encoding=UTF8&psc=1
SUNAVO 1500W Hot Plates for Cooking, Electric Single Burner with Handles, 6 Power Levels Stainless Steel Hot Plate for Kitchen Camping RV and More Black https://www.amazon.com/dp/B081DMHYBD/ref=cm_sw_r_cp_api_fabc_dlC_0rUYFbD0BCG7Q
Etekcity Lasergrip 1080 Non-Contact Digital Laser Infrared Thermometer Temperature Gun -58℉~1022℉ (-50℃～550℃), Yellow and Black https://www.amazon.com/dp/B00DMI632G/ref=cm_sw_r_cp_api_fabc_dlC_psUYFbW97PYV8
Headband Lighted Magnifying Glasses with Led Light, Head Mount Magnifier Glasses Visor Handsfree Headset Magnifier Loupe for Close Work,Sewing,Crafts,Reading,Repair,Jewelry(1.0X to 14.0X) https://www.amazon.com/dp/B07BF7Y7K3/ref=cm_sw_r_cp_api_fabc_YsUYFb3VNAYTJ
Of these items, the tweezers, paste, blue nozzle, magnifiers, hot air, hot plate are in order of priority.
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