When I builds the circuit Pre tone control by IC LF353 the finished , but can not be usable. Because of it wants a power supply +15V GND -15V at 500mA current. I pairs then builds the group Dual DC power Supply +15V,GND,-15V.
By use pillar equipment be IC 7815 , for +15V and IC 7915 for -15V. Which IC the bilateral can give currrent get about 1A. Other detail both of the circuit and model PCB you can see to follow a image.
The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil should be rated about 18 volts at 1 amp or higher, allowing for losses in the regulator. An application for this type of circuit would be for a small regulated bench power supply.
The components list
IC1___LM7815___Positive Regulator IC
IC2___LM7915___Negative Regulator IC
C1,C2____2,200uF 35V___Electrolytic capacitors
C3,C4,C7,C8____0.1uF 50V-0.22uF 50V Ceramic capacitors
C5,C6____100uF 25V___Electrolytic capacitors
T1___Transformer 15V CT 15V or 18V CT 18V 0.5A to 1A
How to builds this circuit.
This circuit is easy so can assemble on perforated board or Universal PCB board. as Figure 2
and can see video testing circuit.
If you think that This circuit is not good enough. For your work. It is hard to find equipment. You do not have it now. These circuits may be viewed below. It may be appropriate for you.