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Active tone control
Frank Taylor
Hello friends,
Can anyone help me with a circuit for a one or two transistor active tone control for npn transistors used at 15 or 25 volts. This is to go immediately after a preamp and feed the main amp. I am quite capable of making the circuit up but at 76 years of age, my design skills lay with valves/tubes. Any help greatfully received. Steve |
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Re: A question
Himanshu Sharma
hey ,
there is a slot to measure the response of a diode in the oscilloscope..what it does is to compare the output of diode with the input... It shows the result in the X-Y mode of the oscilloscope.. hth, Regards :-), --himanshu sharma : Can you tell me a simple way to measure the responsivity of a : diode. I want to plot a curve in an oscilloscope for two diodes. : : thanks, : JR : : |
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Re: rs 232 pin configuration
Himanshu Sharma
hey ,
toggle quoted message
Show quoted text
Please find enclosed the file that has the pin info... And please do let us know what do you want to do with the parallel port..Its always good to know what all others do make with the same basics....:-) Regards :-), --himanshu sharma ----- Original Message -----
From: iman hermansyah <iman_hermansyah@...> To: <Electronics_101@...> Sent: Saturday, November 03, 2001 12:31 PM Subject: [Electronics_101] rs 232 pin configuration : Guys, : : Would U please tell me how is the pin assignment for : RS-232 com Port ? which one is RX and TX on PC-comm fort? : : __________________________________________________ : Do You Yahoo!? : Find a job, post your resume. : : begin 666 9PIN.zip M4$L#!!0````(`.&K?"J3)O3.-0(``(8'```(````.5!)3BY(5$V=E5]OFS 4 MQ=\K]3O<YFE[`!,2TF0#) (LC91_(LZF/CK@!"1B,C!-MT\_&])4:]1I]0NV M,>?\[KD@8]\%2Q\_KD)XP/,9K#;CV=2'CH;0CYZ/4("#=J.O&X!+PJJ,9P4C M.4+AHN/>WMAWF@85>:()[,KB`'69.Y\,HS_XG')^_(+0Z732*=OKI-[6)=-I M4J.ZHF6%DJ+>H]$Q8WK*#SEHFG23+-=^"+U KN8A]D#Z:/1GG3TY?L$X95S# MOXX4XG;A=#A]YDAZ?(4X)65%N7/*6%*<*JUK6F;GXG11S-=-)DNW#+UOF:;> M'1I&!Q@Y4&<2+L+(P\O(M=%+'>-E\.B.8)4QX 685C/S$G+D(@B(!U:N_6VY MP+ C,76\,B,Y5-EOZI@N3BGLBCPO1$E[X&2;4ZA241OPM,G :"P[6D$F>IM0 M(,*OXH0EI$Q@!,<+4\Y(R]1M)'$NV.A]LB@KF'X'DF=[YL0B-RWE/>R-9R'$ M-,_71Q*+HIQ!LUJ1))$K$[9%F=#2,<33`#9NPK?3J!GE+'@7:Z]QM%Q,7'OC MCC39)[_-6)0VVHB>GK?A[-0&L1$./N9]?@G_-/_;7ERB#^20[ET(_."UU_]5 MH]0-KW0*<!,B%7;OK4P!W0.L@C;?RA30?0API,(VKH0*= LF"Y7D]U<Z!?@` M@K5*]&N=`OP>(KQ6@/>O= KP(?A*<.M*IP`?0315^>#,5]V+7!ROER+$I3DY MQ2A/7#&*T]B]",Y[S?_N]N8/4$L!`A0`% ````@`X:M\*I,F],XU`@``A@<` M``@``````````0`@`+:!`````#E024XN2%1-4$L%!@`````!``$`-@```%L" $```````` ` end |
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Quick mesage from the moderator... Was (Re: PIC resources)
--- In Electronics_101@y..., Peter tremewen <Ptremewe@b...> wrote:
I'm also very happy at the amount of traffic on the group, though keeping up with it all with my otherEmail load has been fun, and apologies to those who don't like 30 to 50 plus emaila day. If a member is experiencing e-mail overload, they can simply change there settings to "No Email," and read from the web as I do. The title often tells you if you want to delete or read. And the Yahoo interface allows you to expand the messages so you have something like a digest. I am sure most of you know this already, but if there are those of you who don't, now you do, if you got this far. Very best regards,Don Home of the "Living in the Philippines," list, Where Expats give advice to would be Expats and Travelers about Living traveling doing business and playing, in the Land of Smiles. |
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Boardmaker 3.00
hi friends;
I need a pcb drawing programme which operates under the windows... =)) It could be Boardmaker 3.00 , I used 2.00 before in dos. If u know, where ? can find the crack of it...it will be very usefull..... thanks to eveybody...... love from.... erdem. __________________________________________________ Do You Yahoo!? Find a job, post your resume. |
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Re: Parallel Port Interrupt
GT Bradley
try looking at
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Show quoted text
it has links to more information on parallel ports than almost anyone could want. GT adityanewalkar@... wrote: Hi, |
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Re: PIC resources
aconto
¿ªÔÆÌåÓý? Sure seems to be a lot of group moderators on this list¡. or at least want-a-bees. You know I know we all have opinions and questions. So if a person doesn¡¯t like the topics here they don¡¯t have to be here¡ but I also see how my inbox has gotton full of crap too. I am here for information not drama¡I can get that from Springer or any other TV program for that matter -----Original
Message----- ? Of course, we could go further on and say that any questions regarding a diode should be directed to the a diode list, either on Yahoo! Groups or Usenet or something. And transistors to a transistor list, and so on. Which at the end leaves this group with nothing. ? Bottom line is I think that ANY general electronic question can be asked here. Anything from resistors to shoot making a PCB board. Everything is 101 stuff. Now, if you want to know how to make a super efficient multitasking PIC OS, then yeah, pic list would give you a good answer. But I bet that most guys from pic list are in this group too. And wouldn't such advance question be intriguing for beginners? I know I sure got pretty tired of just learning about the real basic stuff when I started. It was fun seeing and touching into the advance things too. That way I could easily apply the beginners stuff with advance stuff! ? Mounir -----Original
Message----- Yes this is all
well and good but if someone wants questions answered
Electronics_101-unsubscribe@... Your use of Yahoo! Groups is subject to the . |
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Re: PIC resources
Yes I am in full agreement. The misunderstanding is not in the
freedom of being able to ask questions it is in the answers received. I can ask questions about my cat on the dog list and I will get answers but I might get better answers on the cat list. I appoligize if I was misunderstood as promoting censorship. --- In Electronics_101@y..., Mounir Shita <mshita@c...> wrote: Of course, we could go further on and say that any questionsregarding a diode should be directed to the a diode list, either on Yahoo!Groups or Usenet or something. And transistors to a transistor list, and soon. Which at the end leaves this group with nothing.asked here. Anything from resistors to shoot making a PCB board.Everything is 101 stuff. Now, if you want to know how to make a super efficientmultitasking PIC OS, then yeah, pic list would give you a good answer. But I betthat most guys from pic list are in this group too. And wouldn't suchadvance question be intriguing for beginners? I know I sure got prettytired of just learning about the real basic stuff when I started. It was funseeing and touching into the advance things too. That way I could easily applythe beginners stuff with advance stuff!answered about the PIC microcontrollers they will get better answers from atopic since there is one.are also discussed in physics so capacitors could be discussed oneither list. If there were a capacitors discussion list then betteranswers to capacitor questions would be found there.about where the best answers can be found.so muchwholethat you can run Windows on it, unless you of course alter the tocircuit. thisasgroup. Of course, if its more into specific software codingtechniques ofPICs (or whatever) then a pic list would be better. But generalprogrammingquestions, microcontroller interface etc, belongs to this group much as<capacitors and charge :) 060580 37:HM/A=766844/R=0/*>M=178320.1681224.3212089.1261774/D=egroupmai l/S=1706058037:HM/A=766844/rand=587613582> |
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Re: Why are Coaxial cables 75 or 50 Ohm?
Jim Purcell
Steve,
uhhh.... yeah... well, the uhh, "subject" header does sorta state the question pretty plainly.I have a bad habit of not reading subject headers since threads often go far afield from the original topic. I recall that on my favorite BBS they could go on for weeks. :-) Jim |
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Re: choke
Jim Purcell
Himanshu,
a quick response...it works as an inductor...which reduces the current butThe way I compared coils, chocks and otherwise, with capacitors was... Inductance passes DC, and opposes AC (but that is frequency dependent) A capacitor does the opposite, it blocks DC and pass AC (again frequency dependent) I can think of two common uses of a choke coil, in power supplies (in the old days mostly, and RF circuits. In RF each stage of an RF amplifier got it's power connection through an RF choke, which along with a capacitor, kept the common power supply connections from coupling RF between amplifier stages and prevented the oscillation that would result otherwise. In power supplies choke coils worked with filter capacitors to 'smooth' the pulsating DC that comes from diode rectification of AC. In this instance I would say that coils oppose change in current and capacitors oppose changes in voltage. Jim |
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Re: A question
Do you mean a curve tracer?
Here is a build your own circuit using a transformer. Add a variac to the transformer so you can adjust the voltage. Change the resistance to change the diode current. Look at figure 6.1 This information was found performing a search using the key words: curve tracer diode build using the google serach engine. --- In Electronics_101@y..., "Ramachandran Jothikumar" <jrchandran79@y...> wrote: hai guys, |
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Re: PIC resources
Mounir Shita
¿ªÔÆÌåÓýOf
course, we could go further on and say that any questions regarding a diode
should be directed to the a diode list, either on Yahoo! Groups or Usenet or
something. And transistors to a transistor list, and so on. Which at the end
leaves this group with nothing.
?
Bottom
line is I think that ANY general electronic question can be asked here. Anything
from resistors to shoot making a PCB board. Everything is 101 stuff. Now, if you
want to know how to make a super efficient multitasking PIC OS, then yeah, pic
list would give you a good answer. But I bet that most guys from pic list are in
this group too. And wouldn't such advance question be intriguing for beginners?
I know I sure got pretty tired of just learning about the real basic stuff when
I started. It was fun seeing and touching into the advance things too. That way
I could easily apply the beginners stuff with advance stuff!
?
Mounir
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Re: choke
Himanshu Sharma
hey ,
toggle quoted message
Show quoted text
a quick response...it works as an inductor...which reduces the current but doesn't consume the power...it also helps in increasing the current slowly... it is made up of coils...(mostly of cu or al..) Regards :-), --himanshu sharma ----- Original Message -----
From: Ste ve <astrodood@...> To: <Electronics_101@...> Sent: Saturday, November 03, 2001 2:15 AM Subject: [Electronics_101] choke : Hello, : : I'm a new addition to this group. 1215 members? wow! I had to see what : all the commotion was about. : : A question to get rolling: How does a choke work? How are they made? : : thanks. : : Steve. : : _________________________________________________________________ : Get your FREE download of MSN Explorer at : : |
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Re: PIC resources
Yes this is all well and good but if someone wants questions answered
about the PIC microcontrollers they will get better answers from a PIC discussion group. I have been in several PIC discussion groups over the years and found them very helpful. Asking PIC questions on this list is a little like asking VHDL questions on this list. It's related to electronics but I will probably get better answers on a discussion list devoted to the topic since there is one. I don't think there is a capacitors discussion list and capacitors are part of beginning electronics (electronics 101). Capacitors are also discussed in physics so capacitors could be discussed on either list. If there were a capacitors discussion list then better answers to capacitor questions would be found there. It is less about what should be discussed on this list and more about where the best answers can be found. --- In Electronics_101@y..., Mounir Shita <mshita@c...> wrote: To a certain degree, I think electronics can be discussed in aphysics group. However, the tie between microcontrollers and discretecomponents are much stronger than physics and electronics.interface with general electronics. I would say the discussion of Pentiumprocessor are much far off the topic cause these are not considered or meant tobe used in embedded systems. A microcontrollers firmware can not be altered somuch that you can run Windows on it, unless you of course alter the wholethis group. Of course, if its more into specific software codingtechniques of PICs (or whatever) then a pic list would be better. But generalprogramming questions, microcontroller interface etc, belongs to this group asmuch as capacitors and charge :) |
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Re: A question
Mounir Shita
¿ªÔÆÌåÓýYou
mean voltage vs time?
?
If so,
can't you just use a voltage stepper to increase the voltage on both diode by
f.example 0.05V. Use a channel for each diode.
?
I have
a feeling I totally misunderstood the question :)
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Re: Parallel Port Interfacing
Do you mean slow compared to a parallel port or to an ASIC?
--- In Electronics_101@y..., "Himanshu Sharma" <hs_ramdev@y...> wrote: hey ,netlists.....) require a : IEEE 1284 compatible controller on the board to communicate withthe : PC.controller? or : 2) Buy an off-the-shelf IEEE 1284 compatible controller andprogram : the FPGA to operate in conjuction with this controller??material : available about. However CD1283 has a bit complicatedarchitecture. : Is there any other/simpler/probably cheaper controller available?? |
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Re: PIC resources
Mounir Shita
¿ªÔÆÌåÓýTo a
certain degree, I think electronics can be discussed in a physics group.
However, the tie between microcontrollers and discrete components are much
stronger than physics and electronics.
?
Another point, a microcontroller is designed
specifically to interface with general electronics. I would say the discussion
of Pentium processor are much far off the topic cause these are not considered
or meant to be used in embedded systems. A microcontrollers firmware can not be
altered so much that you can run Windows on it, unless you of course alter the
whole circuit.
?
So
simply, yes, I still think microcontroller discussion belong to this group. Of
course, if its more into specific software coding techniques of PICs (or
whatever) then a pic list would be better. But general programming questions,
microcontroller interface etc, belongs to this group as much as capacitors and
charge :)
?
Mounir
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