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Home / Essays / 2015 / March / Matching Transistors for TTSH
March 7, 2015

Matching Transistors for TTSH

At Muff Wiggler I've found some hints and a circuit for transistor matching. I've built that circuit on stripboard and now can start with the transistor matching: The TTSH design uses various pairs of 2N3904 and 2N3906 transistors. These pairs should each have a very similar base-emitter voltage (within 2 mV difference).

Transistor Matching Circuit BoardTransistors 2N3904 and 2N3906 ready to be tested.
Transistor Matching Circuit Board, wiring side

And here we go for the matching. Measuring transistor after transistor:

Measuring Base-Emitter Voltage of a Transistor

All 2N3904 NPN transistors are pretty equal, with a base-emitter voltage of 615mV to 617mV. The 2N3906 PNP transistors spread a little more, from 603mV to 609mV, but many with 606mV or 607mV.

Read more in TTSH

The Thonk and Balzer Deliveries for TTSH Let the TTSH Soldering Begin
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  • TTSH 21: PSU Reloaded
  • TTSH 20: Midi2CV
  • TTSH 19: Case
  • TTSH 18: Test of Finished Board
  • TTSH 17: Main Board
  • TTSH 16: LED Drivers, Jumpers and Headers
  • TTSH 15: S&H, Internal Clock, Analog Switch and Amplifiers
  • TTSH 14: Mixer, Reverb, Noise and Voltage Processors
  • TTSH 13: Preamp, Envelope Follower and Ring Modulator
  • TTSH 12: VCA
  • TTSH 11: ADSR and AR
  • TTSH 10: VCOs and VCF
  • TTSH 9: All Components Available
  • TTSH 8: Thonk and Balzer Components
  • TTSH 7: Transistor Matching
  • TTSH 6: Soldering
  • TTSH 5: Mouser the 2nd
  • TTSH 4: Mouser Components
  • TTSH 3: Components and PSU
  • TTSH 2: Delivery
  • TTSH 1 - The Story Begins
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