[opamps]

if I do something like in the picture; will it work?? - any suggestions for the IC's?? will 741 work? I prefer somthing of very good quality - so any ideas.
Many thanks

[opamps]

Audioguru, I don not know about adding or subtracting matrices; where can I learn, any ideas of any IC's which I can use???

Thanks

[opamps]

ok audio guru, here is it. thanks

[opamps]

Thanks AudioGuru; but what about that schematic of the opamp with 2 +ives as the inputs - what do those mean

thanks

[opamps]

Hello everybody

I have a difficulty. On the attahced .jpg file one can see 2 symbols of an opamp. But one opamp has 2+ instead of 1+ and 1-. Does this means that the oparational amplifier is used as not as an non inverting amplifier.?? Also how can I make it without any gain??

Also when I have to build this circuit, those amplifiers have to have no gain. so for the normal non inverting opamps, I do not do the feedback resistors??
??? ??? ???
Thanks for your help and patience

[digital]

can anyone recommend a book which has some digital boolean algebra or karnaugh maps and worked examples of these

thanks

[5 second delay System]

Hello,

I suggest that for the 5 Sec dalay you can purcahse a processor specifally made for audio delay - they are nice 1U boxes and not quite expensive considering that they can run a couple of effects (gating, compression etc). Can I suggest names of companies in this forum ?? if you want??..



mettula

[5 second delay System]

Hello,

I suggest that for the 5 Sec dalay you can purcahse a processor specifally made for audio delay - they are nice 1U boxes and not quite expensive considering that they can run a couple of effects (gating, compression etc). Can I suggest names of companies in this forum ?? if you want??..

mettula

[synthesiser]

hi guys

I am in need of the circuit diagram of NX2000 technics synthesiser. I need it because I have tha mentioned synth but it is not working ( no sound comes out - but the amps work :'() Anyone with an idea of what can I do?? Thanks for the great help as usual :)

[4 Watt FM Transmitter]

u can make the veronica - it has a preemphasis network and a pll so it is very stable fm exiter, it only needs an rf power amp if there is any volnteer.....;)

veronica_1w_pll_pro_transmitter.rar

[rf power amp]

for fm band - 88 - 108 MHz - i do not wish to use a BLY90 / 86 or similar as these amplify a lot - I'd tought I'd go for 2SC1971 - what do you think?

[rf power amp]

have you got a schematic plz for me - thanks...

[Transistor BF 494]

audioguru the varicap i found it - i am uploading the full schematic and files of the veronica including pcb, parts list  instructions etc - more power to this comunity lol maybe u wanna use it somewhere else

veronica_1w_pll_pro_transmitter.rar

[Transistor BF 494]

lol audioguru i finally collected all the parts - and yeah it would have been much easier if i would have bought it  :P :P

[Transistor BF 494]

they were around LM2.50 which makes approx 1-1.5 euwos for 5 transistors and acouple of heatsinks....

[Transistor BF 494]

THANKS staigen for your offer, yeah indeed  thanks a lot but i found a retired ex-army official and had a couple of BF494 which he sold me. Thanks again m8. and yes gozo - malta are an-eu country. YOU GUYS ROCK ;D ;D :) :)

[Transistor BF 494]

Hi mettula

Where in the world are you living, the BF494 is one of the most common HF-transistors in the world! ;D


//Staigen

Staigen i live in Gozo a sister island of Malta - here few are in the rf field and many times for a school project or hobby we have to import components from abroad which makes projects expensive. some shops do provide help but sometimes this forum helps better  ;D ;D ;D

[Transistor BF 494]

But are SK B1382 and 2SK1382 equvalents of BF494? or as i said can i use 2N2219 of BF3553

[Transistor BF 494]

i wish to ask again  :-[ :-[ :-[ i am not good in electronics  :-[ :-[ :-[ can i for the schematic  of veronica 1w pll pro use 2N2219 or 2N3553 or something equvalent instead of the BF494??? my local shop has nt  BF494 or BF 184 thanks a lot :-[ :-[ :-[

and can anyone suggest a page for transistor equivalent plzzzzzzz

[caps]

the brand is labtec and has also written with 3D spatilizer 3Ds sound.as for version on the main board there is written labtec BG main REV 1.5. it uses a pait of tda2005 as amplifiers, also present there are 2 LM386, 2 TL074, LM13600 and PSZ740P :-[ :-[ :-[

[caps]

what i really mean is how to know which capacitor is faulty if it is in a circuit. For example - I
have an amplifier and it has its'left channel - no sound is coming out - the coupling cap is off and how to locate it.
Also when no input signal the sub makes a 100Hz noise is it the decoupling cap?if yes how to locate it

thanks for your patience

[caps]

i wish to ask, exactly how do you verify if a capacitor is good or opend/clesed by means of digital multimeter thanks!!!! >:(

[rf power amp]

hello all out there, i need a schematic to try and boost an rf power of 1 w to 3 or 4 watts for personal training on rf. Pleaser i need a circuit and/or schematics.!!n 10ks guys :)

[74LS193 and CD74HCT193E]

thanks very much guys, i will try and maybe everything will melt........

[7v5]

attached find the complete pcb diagram..the highlighted 2 diodes are 7v5, the others 1n4148 or 4001