Post by keurslagerkurt on Apr 17, 2021 14:13:19 GMT
Hi all!
Been matching transistors by hand yesterday, as I need some for other builds (more on that soon!). I started from a transistor matching design by the legendary Ray Wilson for Music from Outer Space. However, I don't have a benchtop powersupply, so I wanted to adapt it from using a +-10V bipolar power supply to the 5V from AE.
The adaptation seemed to work fine, but the real verification will of course only follow later when I can test the pairs in a design. Thought I'd share the adaptation here if other ppl want to try their luck! It's best to also read the measuring instructions over at the MFOS website i linked above.
Here is the schematic for npn transistor matching, for pnp you can use almost the same, i marked the changes for pnp matching in GREEN. Made some scribbles in BLUE with voltages you should be able to measure to verify if you connected all well.
Here is the pretty compact breadboard build:
You can see I added some extra caps, these are decoupling caps of 0.1uF over the MCP power rails. They tend to stabilize the power supply voltage & workings of the MCP. You can check out the MFOS link above for some more info on that too!
Cheers!
Zeno / Kurt
Been matching transistors by hand yesterday, as I need some for other builds (more on that soon!). I started from a transistor matching design by the legendary Ray Wilson for Music from Outer Space. However, I don't have a benchtop powersupply, so I wanted to adapt it from using a +-10V bipolar power supply to the 5V from AE.
The adaptation seemed to work fine, but the real verification will of course only follow later when I can test the pairs in a design. Thought I'd share the adaptation here if other ppl want to try their luck! It's best to also read the measuring instructions over at the MFOS website i linked above.
Here is the schematic for npn transistor matching, for pnp you can use almost the same, i marked the changes for pnp matching in GREEN. Made some scribbles in BLUE with voltages you should be able to measure to verify if you connected all well.
Here is the pretty compact breadboard build:
You can see I added some extra caps, these are decoupling caps of 0.1uF over the MCP power rails. They tend to stabilize the power supply voltage & workings of the MCP. You can check out the MFOS link above for some more info on that too!
Cheers!
Zeno / Kurt
