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Recent content by vinctal

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    [SOLVED] Virtual ground in op amp circuit design

    Hi , I have update the simulation result. kindly refer to the attached figure. Figure 1(a), Figure 2(a) and Figure 3(a) are the same circuit. ( a virtual ground circuit, where the output voltage of the op amp = Vdc/2) so output voltage of the op amp in Figure 1(a), Figure 2(a) and Figure 3(a)...
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    [SOLVED] Virtual ground in op amp circuit design

    Hi I have simulated 2 circuit in PSPICE, Figure 1(a) and Figure 2(a) is a virtual ground circuit a voltage reference of 5Vdc The two resistors form a voltage divider so that Vcc/2 appears at the non-inverting input of the op amp. Since it is set up as a follower, Vcc/2 also appears at the...
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    [SOLVED] Lead Acid Battery internal resistance

    Hi, How to measure internal resistance of 12V 7.2AH lead acid battery ? Thank you very much ! Vinctal
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    [SOLVED] PIC18F4550 voltage measurement

    Hi , I don't understand why in my case the source impedance R1 || R2 = 7.5kOhms. Can anyone explain to me ? Thank you very much ! Vinctal
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    [SOLVED] PIC18F4550 voltage measurement

    Hi , I've been trying to figure an easy circuit for battery's voltage measurement, then translating that voltage to an input 0-5v that could be read by a PIC18F4550 microcontroller. My idea is to have the voltage from the battery divided, so that the voltge would come out to be less that 5V...
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    [SOLVED] PIC 16F877A Timer 0 interrupt service routine

    Hi, I am new in Microcontroller programming. I wish to investigate the duration taken to execute Timer 0 Interrupt. Port RB1 is set to high upon entering interrupt service routine and Port RB0 is being toggled every time when Timer 0 Interrupt occurs. So RB0 output is being monitored to...

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