Did you like to lestion the good music from a cassette Deck. You need to use
We have two circuits,Stereo tape head preamplifier circuit and low noise version. They are cheap for beginner
Stereo tape head preamplifier
The circuit diagram
This is stereo can connect to the tape header that resistance between 200-600 ohms at output amplitude about 250 mV.
Making Stereo tape head preamplifier
First you should make PCB as Fig 2 and assemble them on PCB as components layout. it small size you can build easy.
The power supply voltage that can use positive and negative between 9-18 volts. Because there is the dc regulator inside this IC that.
The parts you will need.
IC1_____________UPC1032H ____Dual Low Noise Preamplifier Silicon Bipolar Monolithic Intergated Circuit
R1, R2__________56 ohms ____1/4W Resistors tolerance: 5%
R3, R4__________2.7K____1/4W Resistors tolerance: 5%
R5, R6__________100K____1/4W Resistors tolerance: 5%
R7_____________1K____1/4W Resistors tolerance: 5%
C1, C2_______________0.001uF 63V Polyester Capacitor
C3-C4, C6-C7, C10-C11_10uF 25V Electrolytic Capacitors
C5___________________47uF 25V Electrolytic Capacitors
C8, C9________________0.01uF 63V Polyester Capacitor
Low noise tape head preamplifier
This is a low noise tape head preamplifier that good sound quality. Because use LM387N that is the low noise ICs and is designed for the specific preamplifier.
Maximum the output at 1 volts which is is high enough to drive easily the high power amplifier. The input can be connected with the tape head that have the resistance between 100-600 ohms.
The circuit has a very high growth rate, when apply the power supply to the circuit in first. The circuit not works immediately, have to briefly wait so can listen to sound at the output.
How to builds and uses
In Figure 2 is actual-size of Single-sided Copper PCB layout and Component layout.
The applications for this circuit. We must connect the negative of tape head to the main ground, to prevent the noise signal, especially from radio signals.
The parts you need
IC1_LM387___Low Noise Dual Pre-Amplifier
C1, C5__1uF 50V___Electrolytic capacitors
C2, C3__100uF 16V___Electrolytic capacitors
C4, C6__10uF 16V___Electrolytic capacitors
C7, C8__0.0033uF 50V__Ceramic capacitors
C9_0.1uF 50V_____Ceramic capacitors
R1, R6__________240K____ 1/4W Resistors tolerance: 5%
R2, R5__________27 ohms_________”________”_______
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