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Fix MP3 link in Appendix

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mattbk
2024-07-03 15:00:38 -05:00
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Open-Headset-Interconnect-Standard.md
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@ -409,7 +409,7 @@ This simple design is included in the Standard for all to use with no obligation
* Q1: S9013, or similar NPN BJT transistor.
* Tests were performed (by Mark Smith in 2022-08) using an S9013 transistor, but nearly any small signal NPN BJT should work. For example, a 2N3904 (through hole) or MMBT3904 (surface mount) should work equally well.
An example recording of audio through this microphone preamp design is [here](https://halibut-electronics.github.io/Open-Headset-Interconnect-Standard/2022-08-18%20First%20Test%20Of%205%20Component%20Preamp.mp3).
An example recording of audio through this microphone preamp design is [here](https://open-headset-interconnect-standard.github.io/ohis/2022-08-18%20First%20Test%20Of%205%20Component%20Preamp.mp3).
This circuit is only a slight modification of a conventional common emitter transistor amplifier, similar to what's analyzed [here](http://www.guitarscience.net/calcs/ce.htm). The difference being that we are using the 2.2k ohm resistor in the Radio side (upper right corner above) as the collector resistor. This means the top-side base resistor (R1 above) connects to the output, not to Vcc.