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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by leejongfan

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    Glitches filtering using RCR filter

    Hi all, I am designing a ADC circuit using ADS62P49 **broken link removed** There are few things I am not clear about this analog front-end design: - RCR filter:what is its function ? is it the same as RC filter because we can combine 2 resistors in series together ? If not, why ...
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    LM386 Mini Amp

    Thank you so much for your reply. But could you please elaborate more ? Right now I only have single-core wire Twisted pairt: did you mean I have to "twist" or "wound" together 2 wires ? Like this link Twisted pair - Wikipedia, the free encyclopedia These 2 wires are for the power supply ( GND...
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    LM386 Mini Amp

    Hi audioguru, Really appreciate your help! I searched on Internet to know what "shielded cable" means. But not really understand though. Do you know anyways I can build a self cable myself (no need to be so perfect)
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    LM386 Mini Amp

    I have been trying to use this LM386. Actually, when I used breadboard to build my 1st prototype, it worked fine (yeah still had noise but acceptable, at least i can understand the sound) But now I am doing the prototype using PCB and its performance is very bad. I cant even hear anything...
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    Voice Recording On A Chip - Schematic & Pcb Artwork Wanted

    Hi all, I am trying to build a voice record/playback using ISD25120P chip. I constructed a circuit according to the sample circuit for Push-button mode in page 33. figure 7, datasheet except: - 8 Ohm instead of 16 Ohm speaker. - I did not have those 1 uF polarized caps When in playback...
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    Roman Black's BTc Sound Encoder (mostly working)

    Thanks a lot, I am purchasing a LM4860. In fact, i have a very stupid question to ask: when we build such a circuit with an audio output, and we want to drive a speaker: - how do we know what kind of speaker we should use ? I mean what are the specifications we should pay attention to...
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    Need help ISD4002

    I have basic background in programming C for PIC such as LCD, Keypad, UART... Yes, it's my first project but not my project includes many small features I don't think I have such a thing. I use Mikro C to program and compile source code to .hex file, then use Winpic800 as Programmer No I...
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    Need help ISD4002

    I've just changed. Still cannot work! At least I think I should have something :D
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    Need help ISD4002

    Hi Shan, Thanks a lot. Could you please send me any materials of your project you keep. Although our projects are not very similar but I believe I can learn something from you Thanks
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    Roman Black's BTc Sound Encoder (mostly working)

    Actually, ISD4002 has a built in Amplifier,hence i dont think it's a problem
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    Roman Black's BTc Sound Encoder (mostly working)

    Hi, I bought one and tried to run it, but still cannot work Worse, actually i dont know how to debug it Following is my code in Mikro C for recording void main() { ADCON1=0x06; //RA5 Digital I/O TRISA=0x20; //!RA5=SS: output for Chip Select TRISC=0x10; //RC5:output...
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    Roman Black's BTc Sound Encoder (mostly working)

    Mikro C to play sound I used BTc Encoder sound to generate following code for a short meesage: void sound_data1() org (1 * 256) { asm retlw 0x12 ; asm retlw 0x5E ; asm retlw 0xFE ; /// LINE 370 .... asm retlw 0xDF ; asm retlw 0xC4 ; // reserved for MikroC...
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    Need help ISD4002

    Hi, I bought one and tried to run it, but still cannot work Worse, actually i dont know how to debug it Following is my code in Mikro C for recording void main() { ADCON1=0x06; //RA5 Digital I/O TRISA=0x20; //!RA5=SS: output for Chip Select TRISC=0x10; //RC5:output SDO...
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    Trouble with Audioguru's FM Transmitter circuit

    Thanks a lot for your comments! Besides this problem, I concern about other things as well: - How about relative position of the components ? - Let's say we have to use wire to connect 2 points. The wire should be in the metal side,right ? (Veroboard has metal side and non-metal side)...
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    Trouble with Audioguru's FM Transmitter circuit

    Hi, I am trying to build this circuit (project 54) using veroboard. Can you give advice on the component layout and spacing : **broken link removed**
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