The LM317/LM337 is one of the most used circuits for low power audio applications. The performance is good. For most applications, these integrated circuits work really well. But sometimes you may want something better and more modern. There are two interesting ICs for audio applications:
LT1963/LT3015: These ICs from Linear technologies are relatively expensive in low volumes. It looks like an interesting device for do-it-yourself use, because it is even available in TO220 packages.
TPS49xx/TPS30xx: This pair can be a nice replacement for the 150mA LM317T/LM337T. They are not too expensive, therefore you may even use more multiple devices of you need more than the 150mA. One specific use case is using them as regulators after a switched mode power supply. However there is one disadvantage for DIY use: They come in a 0.65mm pitch MSOP package. But even these devices can be soldered without a reflow oven. Check out Daves EEVBlog for a tutorial how to do this.
The part lists for our turntable power supply solution were not online yet. But this has been fixed. You can find it here:
I’ve included links to components for Digikey and the german distributor Reichelt Elektronik. However make sure that you check your order again, I can’t guarantee, that the this always links to the correct product.
For the comfortINA project we were looking for analog switches with a very low resistance. They should be able to use a symmetrical power supply with at least +/-5V.
There are more ICs available for unsymmetrical power supplies. These might be an interesting alternative if you can shift the level of the logic inputs.
Here are the interesting switches with a symmetrical power supply that we’ve found:
Analog Devices ADG1401/1402
These single switch circuits have a Ron of 1Ohm with supply +/-15V. Unfortunately the MSOP package with 0.65mm pitch requires serious soldering skills.
Analog Devices ADG1411/1412
This quad switch has a Ron of < 2 Ω at +/-15V supply. Unfortunately it is only available in TSSOP package, which makes is not so easy to use for DIY projects.
Analog Devices ADG451/ADG452/ADG453
Another (older) quad switch from AD. Unfortunately Ron is about 4 Ohm with +/-15V power supply. The good thing about it: it is available as SOIC an even DIP version.
The Ron of this chip is 2.5 Ω, It is available even in DIP packages which is great for DIY (I still would recommend to use SOIC package, which allows a more compact layout. Unfortunately it is relatively expensive (about 10 US$ in small quantities).
You can see, that the more modern ICs provide lower Ron values. Unfortunately this comes in packages that are harder to solder.
Today I found a pair of NOS[ref]new old stock – components that were produced sometime in the past, but were not used yet[/ref] ROE EYF 06 electrolytic capacitors. After measuring them I was lucky to see, that they still have full capacity (4800uF and 4700uF). And wow – these things look great! The gold color will look great on a black PCB. I’m thinking to design a new PCB similar to the UniSieb circuit, but with these capacitors (only 6 of them will fit on a 8x10cm board, because they are quite large with 30mm diameter).
Any other ideas how to use them?
My SK104 heatsink model for Sketchup/EagleUp is available in 3D Warehouse.