audio article

*** Super Stereo Headphone Amplifier Kit (Good quality)
3V Battery powered
High Performance unit
Parts:
R1_____________10K 1/4W Resistor
R2____________100K 1/4W Resistor
R3_____________68K 1/4W Resistor (see notes)
R4______________1K5 1/4W Resistor
R5______________3K3 1/4W Resistor
R6____________330R 1/4W Resistor
R7______________4K7 1/4W Resistor
R8______________2R2 1/4W Resistor
C1______________1µF 63V Polyester Capacitor
C2____________100µF 25V Electrolytic Capacitor
C3____________470µF 25V [...]

In a recent article, I discussed the difference between parallel and series telephone taps. In this article, I present a very simple and reliable parallel phone tap circuit useful for recording telephone conversations onto a tape recorder.
When installing a telephone tap, its advisable not to cut the telephone line in anyway. Cutting the telephone line [...]

Click to View circuit Function Generator by IC 1458
This is circuit  Function Generato,Use IC 1458
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