Our new Universal Audio Filter offers three filters on one small PCB.
Bandpass, high-pass and low-pass filters are all on the PCB with separate outputs. The filter may be tuned for gain, Q and frequency using three pots mounted on the board. There is, in addition, a single uncommitted amplifier that may be configured as a buffer amp or gain amp.
An interesting feature is the use of an on-board "rail splitter" circuit that allows the TL074 chip to be powered by a split rail voltage while requiring only a single polarity power supply.
Frequency range: 25 CPS up to 20 Kc. The lower frequencies are obtained by using two jumpers to add extra capacitance to the frequency determining circuit.
Input voltage: 100 mv nominal
Gain, Q and frequency adjusted by separate pots.
Filter gain: 13.5 DB with a 100 mv input at maximum gain
Power supply: 20 to 24 VDC single polarity at 50 ma
Output and input ports: Terminal blocks
Power supply input port: Terminal block
Reverse polarity protection: Provided by diodes.
Universal Audio Filter
See schematic for an explanation of the red jumpers
Universal Audio Filter Schematic
Universal Audio Filter PCB
UAF set as a Bandpass Filter tuned for a high Q at a frequency of 1 KCS
UAF set as a Bandpass Filter tuned for a low Q at a frequency of 100 CPS
UAF set as a High-pass Filter tuned for a high Q at a frequency of 3 KCS
UAF set as a Low-pass Filter tuned for a high Q at a frequency of 100 CPS
UAF set as a Low-pass Filter tuned for a low Q at a frequency of 100 CPS