RS Flip-Flop Using OP-AMP
This RS flip-flop is op-amp version of classic flip-flop which uses two inverting amplifier. The non-iverting input is floating, and we can assume that the voltage level of this floating pin is between VCC and ground, while the outputs will always be high or low. The high level of the output will be 1-2 volts …[Read More]
PC (Audio) Signal Generator Using RS232 Port
Using an RS232 port, we can generate square wave oscillation when transmitting data, and this can be “misused” as signal generator (square wave generator). This is a PC Signal generator produce a square wave in audible frequency range. This circuit utilize a transmission of a “U” character from ASCII character set. This character has binary …[Read More]
Tremolo circuit is a kind of sound effect. We can see this type of effect is applied in guitar effect pedals. Tremolo effect is produced if we modulate the amplitude of an audio signal. The shape of modulating signal can vary from square wave, sawtooth, or sine. When we use a square wave, then the …[Read More]
Voltage Controlled Variable Gain Video Amplifier
This is a video amplifier circuit featured with controllable variable gain. The control is done by adjusting the voltage of grid inputs of two FETs, which are configured as programmable voltage divider. This circuit can generate dynamic linear range attenuation up to 100 dB. This circuit still give a linear attenuation even at f=10.7MHz. You …[Read More]
5 A Constant Voltage-Constant Current Regulator
A constant voltage constant current (CVCS) regulator doesn’t mean a system with a constant load, since there will be no regulation in such case. What we call CVCS regulator is a regulator with two modes. The first mode is constant voltage, where the regulator trying to regulate the supply to a variable load at a …[Read More]
Fast Charger for Better Lead-Acid Battery Life
Compromising between the speed while maintaining safe operation for battery charging is an interesting challenge. This circuit can be used to charge a battery , and it’s safe and rapid. To get quickly charged, this circuit charge with initial charging voltage of 2.5V per cell. To keep it safe, this circuit prevent the battery from …[Read More]
Binaural Synthesizer/Mono to Stereo Converter for Small Speaker/Phones
This simple circuit can be used to drive two high-impedance loudspeakers or stereo phones, taking monophonic input (one channel), to produce a stereo signal which spread along the midway between loudspeakers when the input signal contain many frequency components. This circuit has two channels, left and right, right channel has high-pass active filter and left …[Read More]
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