Archive for the ‘Basic Function Circuits’ Category
20 kHz Astable Multivibrator with Transistors
Astable multivibrator or oscillator circuit is based on positive feedback. We can design such circuit using op-amp, logic gates, or transistors. Here we can rely on single capacitor capacitor and resistor for the feedback inside op-amp like transistor circuit, which works over wide range of temperature, voltages and transistor gains. The stability is pretty good, …[Read More]
Logarithmic Amplifier Using MC1556 Op-Amp
The circuit below is a logarithmic amplifier using an MC1556 op amp. The 10K pot is an offset adjustment. Here is a schematic diagram of one classic example of general purpose logarithmic converter circuit employing LM1556 op-amp: The popularity of logarithmic amplifier is decreasing as the microprocessor and microcontroller chips are getting lower and lower …[Read More]
This is an oscillator circuit that can be used for calibrating frequency counters, amateur receivers and frequency meters. This circuit is called 2MHz standard with dividers circuit. This circuit uses two crystals, 100kHz and 2 MHz. Here is the schematic diagram of the oscillator part of the circuit: This circuit is then can be combined …[Read More]
One Second Steps 555 Timer Circuit (0 To 59 S)
The linearity of 555 IC is sufficient to make 1 second precision, and this circuit employs the feature in this design. This timer step circuit can generate a timing steps from 0 to 59 s in 1-s intervals. Here is the schematic diagram of the circuit :
Single Cell Battery 1.5V 20dB Inverting Amplifier
Featuring very low power consumption, 675 nA is the total current consumption for this amplifier circuit. The output voltage swing is 300 mVpp with a 20 kΩ load. This very low power design is made possible by high gain low power operational amplifier CA3078. CA3037 is marked as obsolete product by Intersil, but they suggest ICL7611, ICL7612, …[Read More]
TC9400 Wide Frequency Range Pulse Generator
The reason why TC9400 V/F converter is very useful in the laboratory are because it’s portable, battery-operated, and low cost frequency source. Both pulse and square-wave outputs are provided by the TC9400. A triangular waveform can also be generated by adding an op-amp integrator. The outputs can be frequency-modulated via the FM input. [Circuit's schematic ...[Read More]
Pulse Delay Generator
This circuit is a Delayed Pulse Generator that is used to provide pulse rate and independent control of initial delay. The pulse generator of this circuit is IC1c which the operation is depended on the normally low O/P of the IC1a. The PB1 is used to make the circuit input goes low. When PB1 is …[Read More]
| 
