# My build progress

**URL:** <https://lookmumnocomputer.discourse.group/t/my-build-progress/345>\
**Category:** DIY STUFF\
**Created:** [March 1, 2020, 8:57pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345 "2020-03-01T20:57:53Z")\
**Posts on this page:** 1\
**Showing post:** 1553

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**Author:** ![CTorp](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/ctorp/32/15023_2.png) [@CTorp](https://lookmumnocomputer.discourse.group/u/CTorp)\
**Post date:** [October 11, 2020, 3:01pm UTC](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/1553 "2020-10-11T15:01:00Z")

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![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/d/d0cfc5c7511c1af28d47b9e5638ed2641b3f528f.jpeg) ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/4/410fecfc61d4b8e74439e8f0511362a2a74033b9.jpeg)

Matching transistors for @sebastian’s kassutronics ladder filter using a simple (3 resistors and a diode) circuit by Ian Fritz:

> **[ianFritz-transmat0011\_144.pdf](https://dragonflyalley.com/synth/images/TransistorMatching/ianFritz-transmat0011_144.pdf)**
>
> 108.48 KB

The transistors from mouser (BC547C-A1) were all very close matches right out the bag, triple zeros on the volt meter for most, some 0.001s.

I also had some some tayda just “BC547.”

 ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/d/dcd2b7c9e03cecccc7f34c0ea479e1372f0d43e1.jpeg)

These were not nearly as matchy as the mousers, with readings ranging 20mV difference.

 ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/b/ba75ccd4052c882d8444756ca6e574b85e5c5e1b.jpeg)  
Haven’t messed with any of the trimmers and it sounds and feels fantastic! Easily self oscillates with a nice clean tone. And it looks great!

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