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Recent content by darrylcapulla

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    [SOLVED] [Help] AM Modulation AD633

    I want to create a simple transmitter using AD633, the problem is need to connect the input to a microphone or mp3 player. what pre amp circuit should i use, will LM386 with gain of 200 from the datasheet work? I'm currently using a function generator as a carrier input signal. Transmission...
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    [SOLVED] [HELP] Design square wave osc using 555 timer

    Design square wave oscillator using 555 timer operating at 8khz with 50% duty cycle. need sample design and computation/formula. :)
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    [SOLVED] [HELP] Design Pierce Oscillator 40Khz output

    sorry for late reply, i need is computation and design. i have sample design using bjt but in simulation i've done, it doesn't look like the sample. do all Pierce Oscillator use crystal? and yes, its a homework. - - - Updated - - - computation for this?
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    [SOLVED] [HELP] Design Pierce Oscillator 40Khz output

    Design Pierce Oscillator to generate output frequency of 40khz. Can anyone help me?? please
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    [HELP] Build Automatic Cut off Charger for 7.4 Volts Battery

    @KlausST We don't have any SMD in our market, It takes a week if i order it online. Parts is very limited. :(
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    [HELP] Build Automatic Cut off Charger for 7.4 Volts Battery

    Here is another circuit, but i think this is not a charger for my battery. :(
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    [HELP] Build Automatic Cut off Charger for 7.4 Volts Battery

    Hello, can anyone help me build Automatic Cut off Charger or Smart Battery Charger for 7.4 Volts - 2 x 3.7volts Lithium Polymer Battery 3500mah. Charger will automatically turn off when its 8.2volts(safe voltage) or 8.4 volts - fully charged. I try to search from the internet,and i found...
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    [SOLVED] [HELP] OP-AMP Using LM324

    I think the main problem is already been solved. Thanks a lot guys. :D
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    [SOLVED] [HELP] OP-AMP Using LM324

    Actually i don't know what my Teacher really wants us to do. I don't really know if its a audio amp or what. All i know is, this circuit is connected to a Function Generator - as Vi source of 50mV at 1khz. 1st Stage is op-amp using TL074 , gain of 200 and Vout of 10Volts. Opamp A - He call...
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    [SOLVED] [HELP] OP-AMP Using LM324

    Here's my computation and schematic diagram. Im using 400k for resistor feedback and 30k- R1. We use dual power suppy. :-D can u please check my solution?? thanks!! - - - Updated - - - What values should i set Rf or R1? If i use 20 gain and 330k for Rf i'll get R1 = 17368.42, and for gain...
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    [SOLVED] [HELP] OP-AMP Using LM324

    the signal comes for a Signal Generator or test with mp3 player. This op-amp is connected to a push-pull amp, with 6.125 watts output and input of 7volts peak-coming from op amp. Parts is not so limited, we order it in Manila or buy it online, i choose LM324 because its easy to solve and this...
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    [SOLVED] [HELP] OP-AMP Using LM324

    I want to make an OP-AMP using LM324 - QUAD OP-AMP. Input is 50mVolts & out is 10Volts so the Gain is 200. 1st op-amp is for Buffer. My question is, should i use all three remaining op-amps? Or should i use only one ? Please answer thanks :)
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    [SOLVED] Cascade BJT AMP two stages - HELP

    I miss the homework deadline, so i mark it closed. lol :lol:
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    [SOLVED] Find Q-Point Using Transfer Curve - HELP

    Hello, Can anyone help me to Draw a DC Transfer Curve Analysis for 2n3904?? 15V or Higher for Vce.. Im Using Proteus 8.. Sample of DC Transfer Curve
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    [SOLVED] Cascade BJT AMP two stages - HELP

    Sample of Gain Formula from my book

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