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Posts tagged BF990A

BF990A circuit and application Receiver tube Radio

BF990A circuit and application Receiver tube Radio vcc 9v

200W Tube amplifying circuit

200W Tube amplifying circuit

Low impedance microphone amplifier is the best

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 9-30VDC. If you don’t build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this case, you should directly connect the signal to C7.

The high tones

The treble controls the high tones, middle the mid-range tones and bass controls The treble controls the high tones, middle the mid-range tones and bass controls

Head Phones tube circuit

Head Phones tube circuit BC1004 The BC1004 based OTL headphone amplifier circuit

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