Hello World (capacitor timer?)


Nov 2, 2009

 


----------------------------

#11 Nov 2, 2009

Hey, now I'm having fun with transistors, too. I think!



Mike

--

p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}

Oppose globalization and One World Governments like the UN.

This message made from 100% recycled bits.

You have found the bank of Larn.

I speak only for myself, and I am unanimous in that!



----------------------------

#12 Nov 3, 2009

Just as long as you're having fun, that's alright.



Regards.



Max. K 4 O D S.



Email: max@...



Transistor site www.funwithtransistors.net

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----- Original Message -----

From: "Mike McCarty" Mike.McCarty@...>

To: funwithtransistors@yahoogroups.com>

Sent: Monday, November 02, 2009 12:52 PM

Subject: [funwithtransistors] Hello!





> Hey, now I'm having fun with transistors, too. I think!

>

> Mike

> --

> p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}

> Oppose globalization and One World Governments like the UN.

> This message made from 100% recycled bits.

> You have found the bank of Larn.

> I speak only for myself, and I am unanimous in that!

>

>

---------------

>

> Always keep electrons and holes flowing in opposite directions.Yahoo!

> Groups Links

>

>

>

>



----------------------------

#15 Nov 3, 2009

I hope this forum takes of like it's sibbling. (I think it will!)



Bob

--- On Mon, 11/2/09, Mike McCarty Mike.McCarty@...> wrote:





> Hey, now I'm having fun with

> transistors, too. I think!

>

> Mike



----------------------------

#23 Nov 3, 2009

You are indeed!

Mark KB9VKE



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#215 Jun 21, 2010

I enjoy and am fairly active on "fun with tubes" about which I am somewhat knowledgeable......When it comes to transistors I know just a smidgen more than nothing at all!....bob pearce



----------------------------

#216 Jun 21, 2010

bob pearce wrote: > I enjoy and am fairly active on "fun with tubes" about which I am

> somewhat knowledgeable......When it comes to transistors I know just

> a smidgen more than nothing at all!....bob pearce



Welcome to the group. Here you'll see some familiar faces, from

FWTubes!



Mac

--

p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}

Oppose globalization and One World Governments like the UN.

This message made from 100% recycled bits.

You have found the bank of Larn.

I speak only for myself, and I am unanimous in that!



----------------------------

#217 Jun 21, 2010

Yes, welcome to the group! Yup, transistors can be fun too...and they're not all that difficult to work with either. IF ya know tubes, then you'll find transistors will be fairly similer, (with only a few small caveats).



So-- got any questions about trannys?



Bob, KD5MHQ

--- On Mon, 6/21/10, Mike McCarty Mike.McCarty@...> wrote:



> bob pearce wrote:

> > I enjoy and am fairly active on "fun with tubes" about

> which I am

> > somewhat knowledgeable......When it comes to

> transistors I know just

> > a smidgen more than nothing at all!....bob pearce



----------------------------

#218 Jun 21, 2010

By golly Mac; if there is an electron in the area one can be sure you'll not be very far behind!....bob p

--- On Mon, 6/21/10, Mike McCarty Mike.McCarty@...> wrote:

From: Mike McCarty Mike.McCarty@...>Subject: Re: [funwithtransistors] HelloTo: funwithtransistors@yahoogroups.comReceived: Monday, June 21, 2010, 10:19 AM

bob pearce wrote:> I enjoy and am fairly active on "fun with tubes" about which I am> somewhat knowledgeable......When it comes to transistors I know just> a smidgen more than nothing at all!....bob pearce

Welcome to the group. Here you'll see some familiar faces, fromFWTubes!

Mac-- p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}Oppose globalization and One World Governments like the UN.This message made from 100% recycled bits.You have found the bank of Larn.I speak only for myself, and I am unanimous in that!

---------------

Always keep electrons and holes flowing in opposite directions.Yahoo! Groups Links

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----------------------------

#219 Jun 21, 2010

Along towards the end of a long career in electronics repair I was getting more and more solid state stuff in the shop but I never felt comfortable and had to think tubes and translate to transistor.....I find it bothersome that so few manufacturers use the N code and devise a part number of their own....With tubes it was always so easy to make an identification.....bob p

--- On Mon, 6/21/10, Bob bob4analog@...> wrote:

From: Bob bob4analog@...>Subject: Re: [funwithtransistors] HelloTo: funwithtransistors@yahoogroups.comReceived: Monday, June 21, 2010, 12:55 PM

Yes, welcome to the group! Yup, transistors can be fun too...and they're not all that difficult to work with either. IF ya know tubes, then you'll find transistors will be fairly similer, (with only a few small caveats).

So-- got any questions about trannys?

Bob, KD5MHQ

--- On Mon, 6/21/10, Mike McCarty Mike.McCarty@...> wrote:

> bob pearce wrote:> > I enjoy and am fairly active on "fun with tubes" about> which I am> > somewhat knowledgeable......When it comes to> transistors I know just> > a smidgen more than nothing at all!....bob pearce

---------------

Always keep electrons and holes flowing in opposite directions.Yahoo! Groups Links

*> To visit your group onthe web, go to:�� �� groups.yahoo.com/group/funwithtransistors/

*> Your email settings:�� �� Individual Email | Traditional

*> To change settings online go to:�� �� groups.yahoo.com/group/funwithtransistors/join�� �� (Yahoo! ID required)

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----------------------------

#220 Jun 21, 2010

Heh, sounds like me when I was starting to understand xstrs...had to think of their theory like that of tubes. They are all basically just valves anyway. Only difference is in how they're "fed". Gotta "think" like a diode--bipolar trannys (NPN, PNP)�� are like diodes that amplify. Course, MOSFETs are more like a real triode, exept they have a LOT of input capacitance that needs to be dealt with, epecially with RF. I like to make RF driver circuits to drive tubes. I'm not much for xstr RF output tho, altho I do understand and have worked with 'em.��Yeah, those "N" xstr codes took a bit of learning for me too. I know 'em all pretty good now tho.��Bob Henry

--- On Mon, 6/21/10, bob pearce pearceart@...> wrote:



Along towards the end of a long career in electronics repair I was getting more and more solid state stuff in the shop but I never felt comfortable and had to think tubes and translate to transistor.....I find it bothersome that so few manufacturers use the N code and devise a part number of their own....With tubes it was always so easy to make an identification.....bob p

��



----------------------------

#964 Oct 23, 2012

Well I have finally for now navigated away from tubes for a while and working with solid state devices (a lot more safer I must say!). I am building as a "get my feet wet project" a little simple AM radio using the IC 484 which is "everything" except for a good audio to drive it.



I understand after doing some on line research that this IC has been around since the early 70s. What is interesting to me and hope that someone could explain is how this IC works? Equal to 10 transisors? I am used to the traditional mixer/oscillator, IF stage Xformers, etc. Where and how is the IF generated or is there one?



John, AA2MI

Pity The People Not Having Fun With Solid State Devices"



----------------------------

#965 Oct 24, 2012

Is this the one you mean? It is a TRF that uses the ferrite antenna as the

only tuned circuit. I found references to an LM3820 that seems to be a

superhet chip but I didn't succeed in running down the data sheet for it.

If you find It I would like to have it for my own interest.



Regards.



Max. K 4 O DS.



Email: max@...



Transistor site www.funwithtransistors.net

Vacuum tube site: www.funwithtubes.net

Woodworking site

www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html

Music site: www.maxsmusicplace.com



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----- Original Message -----

From: "John" cqcqdeaa2mi@...>

To: funwithtransistors@yahoogroups.com>

Sent: Tuesday, October 23, 2012 6:43 PM

Subject: [funwithtransistors] Hello Max and the Group





> Well I have finally for now navigated away from tubes for a while and

> working with solid state devices (a lot more safer I must say!). I am

> building as a "get my feet wet project" a little simple AM radio using the

> IC 484 which is "everything" except for a good audio to drive it.

>

> I understand after doing some on line research that this IC has been

> around since the early 70s. What is interesting to me and hope that

> someone could explain is how this IC works? Equal to 10 transisors? I am

> used to the traditional mixer/oscillator, IF stage Xformers, etc. Where

> and how is the IF generated or is there one?

>

> John, AA2MI

> Pity The People Not Having Fun With Solid State Devices"

>

>

>

---------------

>

> Always keep electrons and holes flowing in opposite directions.Yahoo!

> Groups Links

>

>

>

>



----------------------------

#966 Oct 24, 2012

--- On Tue, 10/23/12, John cqcqdeaa2mi@...> wrote:

> From: John cqcqdeaa2mi@...>

> Subject: [funwithtransistors] Hello Max and the Group

> To: funwithtransistors@yahoogroups.com

> Date: Tuesday, October 23, 2012, 7:43 PM

>

> Well I have finally for now navigated away from tubes for a while

> and working with solid state devices (a lot more safer I must say!).

> I am building as a "get my feet wet project" a little simple AM

> radio using the IC 484 which is "everything" except for a good audio

> to drive it.



Watch the supply voltage with those. They're designed to operate on

1.5 Volts, and much over that will quickly kill them.

> I understand after doing some on line research that this IC

> has been around since the early 70s. What is interesting to

> me and hope that someone could explain is how this IC works?

> Equal to 10 transisors? I am used to the traditional

> mixer/oscillator, IF stage Xformers, etc. Where and how is

> the IF generated or is there one?



There isn't an IF with that system. It's a TRF design (Tuned RF).

The design basically consists of a single tuned stage at the input,

followed by a rather incredible gain (1E6?), followed by a detector.

Thus, tuning tends to be rather broad, mainly limited by the Q of the

single tuned circuit, and any loading on it by the AGC/AVC/bias and

the input of the MK484. Thus, don't expect to resolve stations

10 KHz apart. However, you'll also probably find that the stations

received are much higher fidelity, due to the elimination of the

IF filtering limiting the sidebands.



I built a couple of receivers based on that chip a few years ago.

I found I could get adequate volume with a single transistor into

a pair of decent headphones, but that it required a bit more gain,

such as from an LM386, to drive a small speaker.

> John, AA2MI

> Pity The People Not Having Fun With Solid State Devices"



Dave

WA4QAL







----------------------------

#967 Oct 24, 2012

Thanks Max,��I will look for it.��John, AA2MI > Pity The People Not Having Fun With Solid State Devices"



From: Max Robinson max@...> To:funwithtransistors@yahoogroups.com Sent: Tuesday, October 23, 2012 10:45 PM Subject: Re: [funwithtransistors] Hello Max and the Group

��Is this the one you mean? It is a TRF that uses the ferrite antenna as the

only tuned circuit. I found references to an LM3820 that seems to be a

superhet chip but I didn't succeed in running down the data sheet for it.

If you find It I would like to have it for my own interest.



Regards.



Max. K 4 O DS.



Email: mailto:max%40maxsmusicplace.com



Transistor site www.funwithtransistors.net/

Vacuum tube site: www.funwithtubes.net/

Woodworking site

www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html

Music site: www.maxsmusicplace.com/



To subscribe to the fun with transistors group send an email to.

mailto:funwithtransistors-subscribe%40yahoogroups.com



To subscribe to the fun with tubes group send an email to,

mailto:funwithtubes-subscribe%40yahoogroups.com



To subscribe to the fun with wood group send a blank email to

mailto:funwithwood-subscribe%40yahoogroups.com

----- Original Message -----

From: "John" mailto:cqcqdeaa2mi%40yahoo.com>

To: mailto:funwithtransistors%40yahoogroups.com>

Sent: Tuesday, October 23, 2012 6:43 PM

Subject: [funwithtransistors] Hello Max and the Group



> Well I have finally for now navigated away from tubes for a while and

> working with solid state devices (a lot more safer I must say!). I am

> building as a "get my feet wet project" a little simple AM radio using the

> IC 484 which is "everything" except for a good audio to drive it.

>

> I understand after doing some on line research that this IC has been

> around since the early 70s. What is interesting to me and hope that

> someone could explain is how this IC works? Equal to 10 transisors? I am

> used to the traditional mixer/oscillator, IF stage Xformers, etc. Where

> and how is the IF generated or is there one?

>

> John, AA2MI

> Pity The People Not Having Fun With Solid State Devices"

>

>

>

---------------

>

> Always keep electrons and holes flowing in opposite directions.Yahoo!

> Groups Links

>

>

>

>



----------------------------

#968 Oct 24, 2012

Thanks Dave for the information. I guess that explains to me��why they were still using the tube replacement design��using transistors with the miniature IFs in battery powered radios instead of this chip.����John, AA2MI > Pity The People Not Having Fun With Solid State Devices"



From: Dave wa4qal@...> To: funwithtransistors@yahoogroups.com Sent: Wednesday, October 24, 2012 11:39 AM Subject: Re: [funwithtransistors] Hello Max and the Group

��--- On Tue, 10/23/12, John mailto:cqcqdeaa2mi%40yahoo.com> wrote:



> From: John mailto:cqcqdeaa2mi%40yahoo.com>

> Subject: [funwithtransistors] Hello Max and the Group

> To: mailto:funwithtransistors%40yahoogroups.com

> Date: Tuesday, October 23, 2012, 7:43 PM

>

> Well I have finally for now navigated away from tubes for a while

> and working with solid state devices (a lot more safer I must say!).

> I am building as a "get my feet wet project" a little simple AM

> radio using the IC 484 which is "everything" except for a good audio

> to drive it.



Watch the supply voltage with those. They're designed to operate on

1.5 Volts, and much over that will quickly kill them.



> I understand after doing some on line research that this IC

> has been around since the early 70s. What is interesting to

> me and hope that someone could explain is how this IC works?

> Equal to 10 transisors? I am used to the traditional

> mixer/oscillator, IF stage Xformers, etc. Where and how is

> the IF generated or is there one?



There isn't an IF with that system. It's a TRF design (Tuned RF).

The design basically consists of a single tuned stage at the input,

followed by a rather incredible gain (1E6?), followed by a detector.

Thus, tuning tends to be rather broad, mainly limited by the Q of the

single tuned circuit, and any loading on it by the AGC/AVC/bias and

the input of the MK484. Thus, don't expect to resolve stations

10 KHz apart. However, you'll also probably find that the stations

received are much higher fidelity, due to the elimination of the

IF filtering limiting the sidebands.



I built a couple of receivers based on that chip a few years ago.

I found I could get adequate volume with a single transistor into

a pair of decent headphones, but that it required a bit more gain,

such as from an LM386, to drive a small speaker.



> John, AA2MI

> Pity The People Not Having Fun With Solid State Devices"



Dave

WA4QAL



----------------------------

#1020 Nov 14, 2012

Last evening I did my first transistor circuit..........���� Amazing��considering the many projects involving electrical stuff I've builtsince my pre-teen years (60's).������



I received my packet of 10 IRF640 n channel mosfets in the mailyesterday.���� (high voltage moderate current capacity), and proceededto cobble together the basic "hello world" circuit where you justflip a switch and the mosfet lights a small bulb.������ I left out thecapacitor between gate and source just to see how long it would taketo shut off.�� It seemed like it probably would stay lit for manyhours if not days....������ A 470 ohm resistor instantly killedit.���������� This am I pulled the 470 and installed a 10M, thinking Imight be able to see the delay.....NO WAY... instant.���� I theninstalled a 10 uf capacitor I had laying about in parallel to the470 resistor, and achieved almost exactly a one minute oninterval.���� I'm assuming that if I install a capacitor of doublevalue, the delay will be twice as long, and likewise if I increaseor decrease resistor values.�������� Also removed the switch andinstalled a rheostat to dim the light......just for play.



������ This shows me that I can do my "latching relay logic" by simplyusing mosfets and capacitors.�� One mosfet can latch using a cap,another transistor on the appropriate signal can short the cap toground unlatching it, and at the same time latch itself.����



������ I had no real idea what I was missing by not learning how to usethese kinds of components.���� I have P channel mosfets coming as wellas a prototype board with power supply, and a half dozen LM555s formy project.���� I hope to play with more circuits.�� I want to tryusing an N channel and a P channel, running a load on the N channel,and pulling a circuit between the drain of the N channel and thegate of the P channel, putting a dummy load on the P channel (highvalue resistor to ground) on the drain side of the P channel,putting a circuit back to the gate of the N channel between thedrain and the load, with a normally closed switch between.������ Thisseems to me like it should create the latching relay circuit I waslooking for.



������ Lacking a prototype board, I just cobbled this stuff togetherusing some scrap parts, and crudely soldering everything using thelegs of the mosfet as solder terminals, and a needle nose vice gripas a heat sink.���� Later in the week, I expect to have on of thosecool solderless breadboards and a plug in USB powered power supplythat attaches directly to the board so I can make cool looking testcircuits.�� My injector tester circuit will be prototyped on thisboard initially, then transferred to a solder type breadboard.����



������ Here are some of my crude "hello world" project and a schematicof my latching system with two mosfets (p channel and n channel), atthe group web site:������ tinyurl.com/a33jxbv



������ ������ ������ ������ ������ ������ ������ ������ ������ ������ Howard

����







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