Free electronic circuit design and schematic diagram
This is Fast Logarithmic Amplifier circuit. Dynamic range of This circuit has is 80 dB. This circuit is configured to optimize speed rather than dynamic range. To allow the use of feed forward compensation1 on an LM101A operational amplifier, this circuit uses Transistor Q1 that is connected with diode. This compensation can increase the slew rate and extends the bandwidth […]
Read more
We can generate easily many non-linear functions such as X^1/2, X^2, X^3, 1/X, XY and X/Y using logs. Division becomes subtraction, multiplication becomes addition and powers become gain coefficients of log terms. The circuit diagram below shows a circuit whose output is the cube of the input. Actually, by changing the values of R9 and R10 in accordance with the […]
Read more
This is a circuit of Log Converter with 100dB Dynamic Range. This circuit can give a a logarithmic output voltage for a linear input current. This circuit use an LM108 operational amplifier with Transistor Q1 as non-linear feedback element. R1 and R2 are used as divider. Negative feedback is applied to the emitter base junction of Q2 and the emitter […]
Read more
The purpose of developing this circuit is to allow watch crystals to be used in an existing CMOS oscillator circuit that was to run from a 12 V supply. But there is a problem, these crystal only work uo to a supply voltage of about 6V. If the supply voltage is more than 6 V then the crystal will be […]
Read more
This is a circuit of Frequency Doubler using 4011. This circuit uses one CMOS quad, two input NAND gate package type 4011. This circuit consist of two differentiating networks R1/C1, R2/C2, an inverter IC1B and NAND gate IC1A, IC1D, IC1C and function as input and output buffers. Figure below shows the schematic diagram of the circuit and the pulses in […]
Read more
The circuit diagram below shows a constant amplitude triangular-wave generator. A variable frequency triangular wave whose amplitude is independent of frequency is provided by this circuit. As a reset circuit, the generator embodies an integrator as a ramp generator and a threshold detector with hysteresis. There is no further explanation is needed because the integrator has been described in a […]
Read more
Nowadays, the digital potentiometer is available. The digital potentiometer is effective to replace the mechanical potentiometers in a number of areas because it has FET switching under digital control and resistive ladders. The digital potentiometer can be used as a stereo volume control, but there are a some issues which must first be addressed. Here is the schematic diagram of […]
Read more