Die Anfrage
“Draw a 9 V 2N5457 piezo preamp with gate bias, source resistor and bypass capacitor, drain resistor, input and output coupling capacitors, a 100 kΩ volume potentiometer, and a 10 kΩ tone potentiometer.”
Dann probieren SieChange the input capacitor to 22 nF.Change the volume potentiometer to 250 kΩ.
Was diese Zeichnung zeigt
Die dahinterstehenden Entscheidungen verstehen.
01
JFET common source stage for high input impedance and gain
02
Passive volume control using a voltage divider
03
Passive tone control with RC low-pass filter
When building a preamp for piezo pickups that require high input impedance (1MΩ) and variable output level.