circuit problem - Electronic Circuits Projects Diagrams Free

JoeyAndres · 1st February 2008, 08:27 PM

If I connect the output of two reciever to a transistor, something happens that should not

**Nigel Goodwin** · 1st February 2008, 08:56 PM

Perhaps a diagram might help?.

blueroomelectronics · 2nd February 2008, 12:07 AM

Quote:

Originally Posted by JoeyAndres

If I connect the output of two reciever to a transistor, something happens that should not

Ok tell us what happens that's not supposed to happen...

**Krumlink** · 2nd February 2008, 12:30 AM

Lol yah really

**Nigel Goodwin** · 2nd February 2008, 10:16 AM

Yeah, still no information, but the circuit doesn't look like it will work - a 741 isn't going to give you a gain of 1000 at 40KHz, and you seem seriously lacking in decoupling capacitors.

Hero999 · 3rd February 2008, 12:32 PM

All ICs need 100nF across their supply pins and replace the crappy 741 with a TL081. The you stand some haf decent chance of it working..

JoeyAndres · 28th February 2008, 03:40 AM

I only use 24khz, I only copied this schematic from the internet, I use a very high gain op-amp opa27, the current to voltage convertor resistor is 330ohms is replace by 1mohms, and the feedback resistor is also replace with 1M. Thanks for all of your reply, but I already solved my problem, I just replace the input capacitor 10000pf to 1000pf, to cut off half of the frequency.

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1st February 2008, 08:56 PM	(permalink)
Nigel Goodwin	Perhaps a diagram might help?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

2nd February 2008, 12:30 AM	(permalink)
Krumlink	Lol yah really __________________ MechTronics World of Warcraft is a disease

2nd February 2008, 10:16 AM	(permalink)
Nigel Goodwin	Yeah, still no information, but the circuit doesn't look like it will work - a 741 isn't going to give you a gain of 1000 at 40KHz, and you seem seriously lacking in decoupling capacitors. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

3rd February 2008, 12:32 PM	(permalink)
Hero999	All ICs need 100nF across their supply pins and replace the crappy 741 with a TL081. The you stand some haf decent chance of it working.. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

28th February 2008, 03:40 AM	(permalink)
JoeyAndres	I only use 24khz, I only copied this schematic from the internet, I use a very high gain op-amp opa27, the current to voltage convertor resistor is 330ohms is replace by 1mohms, and the feedback resistor is also replace with 1M. Thanks for all of your reply, but I already solved my problem, I just replace the input capacitor 10000pf to 1000pf, to cut off half of the frequency.