Selasa, 22 Juni 2010
Logarithmic Amplifier
Unusual frequency compensation gives this logarithmic converter a 100 us time constant from 1 mA down to 100 uA, increasing from 200 us to 200 ms from 10 nA to 10 pA. Optional bias current compensation can give 10 pA resolution
from -55 degree C to 100 degree C.
Sabtu, 19 Juni 2010
Two Transistors Sine Wave Oscillator
This oscillator uses two transistors and operates the crystal in the fundamental mode. C1 and C2 should be about 2 700 pF for 1 MHz, 680 pF for 5 MHz, and 330 pF for 10 MHz. 150 pF can be used for up to 20 MHz. The output is a near
perfect sine wave. Try varying C1 and C2 for best waveform. About 2 to 6 Vpp is available.
Pulse Generator (with Transistor)
Seven-V narrow pulse from 2 Hz to 50 kHz are produced by this circuit. C1 through C4 provide frequency ranges in decode steps. R1 and R2 control the charging time of C1 through C4. R2 is a potentiometer used to set the frequency. R8
controls pulse width. Pulse width varies from 7 us to 10 ms. Depending on the frequency, R8 can be deleted if it is not needed.
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