Super Stereo Headphone Amplifier Kit - SHA2
by Ramsey Electronics
The kit provides an easy way to listen to your audio source with your headphones when the manufacturer provided no headphone output. It's a superb quality headphone amplifier kit with multiple outputs, looping inputs, daisy chained amplifiers, and bass, treble, loudness control.
The kit runs on a 9 Volt battery or a 12-20 VDC external power supply. Includes separate volume, treble, bass, balance and loudness controls and a signal level clipping indicator LED. The clipping detector circuit watches the headphone output signal and flashes the LED when the output signal comes close to the maximum level.
At the heart of the circuit is an LM1036 (a dual DC operated tone/volume/balance IC), providing the control of all the major functions of the unit including volume, tone, balance and loudness. After being processed the signal is sent to the output amplifiers made with two LM386N ICs. The LM386N IC is a fully integrated, efficient audio amplifier with great fidelity, capable of driving low impedance loads and requiring very few external components.
If you're looking for an affordable kit with many practical uses then try the SHA2, the new generation stereo headphone amplifier!
Parts list:
- R1, R2, R3, R4: 1M ohm resistors
- R5, R6, R8, R13: 47k ohm resistors
- R7, R14: ohm resistors
- R15: 100k ohm resistor
- R16, R18, R19: 470 ohm resistors
- R17: 560k ohm resistor
- R9: 100k ohm switch potentiometer
- R10-R12: 100kohm potentiometers
- C1, C2, C4, C9, C10, C16-C18, C22, C28-C32: 10uF electrolytic capacitors
- C3, C13, C15, C21, C25: 10nF ceramic disc
- C6-C8, C26: 220nF ceramic disc
- C11, C23: 100pF ceramic disc
- C12, C24: 220uF electrolytic
- C14, C27: 100nF ceramic disc
- C19, C20: 390nF ceramic disc
- C33: 470uF capacitor
- D1, D2, D5: 1N4000 series diodes
- D3: red LED
- U1: LMC660AIN quad rail-to-rail operational amplifier IC
- U2, U4: LM386N audio power amplifiers
- U3: LM1036N dual DC operated tone/volume/balance IC
- VR1: 7810 10V voltage regulator
- J1, J2, J3, J4: 3.5mm stereo jacks
- J5: 2.1mm power jack
- S1: DPDT pushbutton switch
- H1, H2: 3 pin headers
- BAT1: 9V battery clip
- 9V battery snap
- jumper blocks for 3 pin headers