Audio Notch Meter
Circuit : Andy Collinson
Email: [email protected]
Description:
A variable notch filter with both high and low pass filters.
![notch filter](preamplifier11.gif)
Notes
At first glance this circuit looks fairly complex, but when broken down,can be divided into high pass and low pass filter sections
followed by a summing amplifier with a gain of around 20 times. Supply rail voltage is +/- 9V DC. The controls may also be adjusted
for use as a band stop (notch) filter or band pass filter.
Source:www.zen22142.zen.co.uk