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Recent content by carp3

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    Pioneer Car Audio Amplifier GM-A3602 Service manual

    This is Owner manual. i want service manual
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    Pioneer Car Audio Amplifier GM-A3602 Service manual

    Hi, Does anyone have service manual for Pioneer GM-A3602 Amplifier ? Thanks.
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    non common ground buffer

    you can measure voltage on the other side and send it as digital signal to your PIC in your side. also you can use Analog Optocouplers
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    reduce current consumption . in a BJT based H-Bridge.

    Hi, My H-Bridge consume 3ma@3.3v when there is no load and both inputs are zero, How can i reduce it ? my goal is <100uA https://i.imgur.com/bHFos.png Q2 and Q8 are SS8550 and Q3 and Q9 are SS8050, other Qs are 2N2222A
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    Ultrasonic Car Parking Assist

    Any reason why?
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    Ultrasonic Car Parking Assist

    Hi, I want to build a parking assist for my car. which way do you recommend ? i have 2 Ultrasonic transducer (40khz) 1. Sensor->Analog switch->Amp->Band Pass Filter->Envelope detector->Voltage Comparator(eg LM324)-> uC EXT INT line. or 2. Sensor->Analog Switch->Amp->ADC(@2msps)->...
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    BF256 and BF494 equivalent (SMD)

    Hi, I have a schematic for ultrasonic preamp@471 kHz . Vin is 20mv p-p and supply voltage is 5V. but non of these transistors are available in SMD. any suggestion for a equivalent from this century? with SMD package. My schematic:
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    6V to 5v ~1mA max. typical 200uA. efficiency >90%

    also more than 3mhz is ok.
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    6V to 5v ~1mA max. typical 200uA. efficiency >90%

    Re: 6V to 5v ~1mA max. typical 200uA. efficiency &gt;90% up to 0.01v is ok. but frequency should be less than 50khz. most of the times(~90% - 1.9sec) my circuit only consume 200µA and according to datasheet LTC3632 consume at least 125µA it self. (active mode) So efficiency is less than 60%...
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    6V to 5v ~1mA max. typical 200uA. efficiency >90%

    Hi, how can i build a high efficiency(>90%) voltage converter for converting 5.2~6v (4*AA) to 5v and 3.3v (dual output)? 1mA max, 200µA typical(each output) /non-isolated . any suggestion? thanks.
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    472khz ultrasoic preamp

    is there any possibility that the output load affect frequency response ?
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    472khz ultrasoic preamp

    472khz ultrasonic preamp Hi, i have a schematic for 471khz (ultrasonic mic)preamp. but as far as i tested this circuit only response to 471khz. but my input frequency is between ~420khz and ~520khz. i don't know how to modify this circuit to have linear amplify for my frequency range...
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    Single Element Ultrasonic transducer RX/TX switching

    i'll take some pictures from oscilloscope tomorrow. i do not disconnect/shutdown amplifier when transceiver is in TX mode. should i ? i'll put my amplifier schematic too( tomorrow )
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    Single Element Ultrasonic transducer RX/TX switching

    Hi, I'm trying to use a single ultrasonic transceiver , but i have some problems with switching from RX to TX. i tried to do this with 74HC125 but i didn't get any response(echo) from transceiver . i think it's not fast enough for switching from High enabled to High impedance mode. but i don't...
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