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IFD:EAI SoS21/course material/Session 5: Soldering (view source)
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Note that the transistor "2N5457" we are using this semester has a slighlty different pinout. Therefore the connections are slighlty different as shown in the photos below. We also need a resistor for draining spurious voltages on the piezo to ground. Without this resistor the amplifier could drift into clipping, outputting no sound at all. The smaller the resistor the lower the gain of the amplifier. Try with a 100kOhm resistor first (yellow band). | Note that the transistor "2N5457" we are using this semester has a slighlty different pinout. Therefore the connections are slighlty different as shown in the photos below. We also need a resistor for draining spurious voltages on the piezo to ground. Without this resistor the amplifier could drift into clipping, outputting no sound at all. The smaller the resistor the lower the gain of the amplifier. Try with a 100kOhm resistor first (yellow band). | ||
[ | [[File:piezo_connections.png piezo preamp solder connections|800px]] | ||
[[File:teensy_connections.jpeg|800px] teensy microphone input soldering] | [[File:teensy_connections.jpeg|800px] teensy microphone input soldering] | ||