Hi Folks!

Video tutorial (I would prefer text version) but I loved the comments, especially #4!


https://www.element14.com/community/docs/DOC-95071/l/the-learning-circui t-72-how-to-generate-a-clock-signal-with-a-555-timer

























































> <
> Barry_Martin_3@ <
> @Q.COM <
> <


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Hi Folks!

Video tutorial (I would prefer text version) but I loved the comments, especially #4!

https://www.element14.com/community/docs/DOC-95071/l/the-learning-circui t-72-how-to-generate-a-clock-signal-with-a-555-timer

> <
> Barry_Martin_3@ <
> @Q.COM <
> <

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Seeing 555 in the Subject Line made me think about a 555 circuit someone helped me do way back in the1970's.

It was for a audio frequency shift circuit for RTTY.

I think it had two potentiometers in series to change the Mark or Space tone. Ed
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Hi Ed!

Seeing 555 in the Subject Line made me think about a 555 circuit
someone helped me do way back in the1970's.
It was for a audio frequency shift circuit for RTTY.
I think it had two potentiometers in series to change the Mark or
Space tone.

Yes: '555' to also immediately reminds me of the very popular timer IC
-- probably built in to other ICs now rather than as a separate chip. I probably have a few in in my Electronics Workbench area in the basement.
Used to do a lot of building and repair.

Here's another memory-invoking part: 2N2222!



¯ ®
¯ BarryMartin3@MyMetronet.NET ®
¯ ®


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Hi Ed!

Yes: '555' to also immediately reminds me of the very popular timer IC
-- probably built in to other ICs now rather than as a separate chip. I probably have a few in in my Electronics Workbench area in the basement.
Used to do a lot of building and repair.

Here's another memory-invoking part: 2N2222!

> <
> BarryMartin3@MyMetronet.NET <
> <

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I used many 2N2222's.

I was in High School when Xsistors showed up in the wholesale electronics store and went there to buy a 2N107 (IIRC) for $1.00 USD.
The next morning I showed it to my classmates and one of them said he would like to have one of those for a project he seen.
So I let him have it for the price I paid for it .

It was many years after that for me to buy another Xsistors.
Back then I had just learned about rectifier tube circuits for a Full Wave power supply.

The AM Radio/3 speed Record Player I had was a "hot box" with a 35W4 rectifier, a 50C5 and one or two other Tubes in it .
Years later I used that for the amplifier for a home intercom by running 2 wires from where the Phono Cartridge cable was connected and put a Jack for Banana Plugs on the end of each of those two wires.

My intercom had a 4 Ohm speaker, a 4 Ohm/10,000 Ohm transformer and a DPDT switch with wires going to Banana Plugs to go in to the Jacks I attached to my combo Radio/Phono.
Oh!, forgot to mention the Rotary Switch to select which room I wanted to talk to.

I had one speaker mounted high over the front door and a couple other speakers in rooms.

Later I put a AC-DC amp a buddy had in his junk pile and put it inside the wooden intercom box so I didn't need to use the Radio/Phono Combo with it anymore.
Ed
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Hi Ed!

I used many 2N2222's.

I was in High School when Xsistors showed up in the wholesale
electronics
storeand went there to buy a 2N107 (IIRC) for $1.00 USD.
The next morning I showed it to my classmates and one of them
said he would
like to have one of those for a project he seen.
So I let him have it for the price I paid for it .

So much for make a profit! <gg>

It was many years after that for me to buy another Xsistors.
Back then I had just learned about rectifier tube circuits for a
Full Wave
power supply.

Back then I built more with solid state -- I guess more because of the mechanical as didn't have to bore out holes for tube mounts -- easy to
drill a small hole to mount a terminal strip or PC board. Repairs were
more tube-based as that's what needed repairing.

I had one speaker mounted high over the front door and a couple
other speakers in rooms.

That reminded me: Dad had a home-office combination so an intercom at
the office door and the kitchen. Could hear street noise when the
volume was at talk level so turned down, but then of course had to
remember to turn back up to communicate. Dad came up with the idea to
use a mercury switch as an on-off switch: upright to talk, lay sidewards
to shut off. No need to touch the volume! (The intercom button by the
door went to a buzzer inside the house doorbell.))

¯ ®
¯ BarryMartin3@MyMetronet.NET ®
¯ ®


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Hi Ed!

So much for make a profit! <gg>

Back then I built more with solid state -- I guess more because of the mechanical as didn't have to bore out holes for tube mounts -- easy to
drill a small hole to mount a terminal strip or PC board. Repairs were
more tube-based as that's what needed repairing.

That reminded me: Dad had a home-office combination so an intercom at
the office door and the kitchen. Could hear street noise when the
volume was at talk level so turned down, but then of course had to
remember to turn back up to communicate. Dad came up with the idea to
use a mercury switch as an on-off switch: upright to talk, lay sidewards
to shut off. No need to touch the volume! (The intercom button by the
door went to a buzzer inside the house doorbell.))

> <
> BarryMartin3@MyMetronet.NET <
> <

... ClientSez: This program says I have insignificant memory.
--- MultiMail/Win32 v0.47
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I learned about Logic Gates from reading a Popular Electronics magazine in the 1970's.
For some reason AND, OR, NOR and NAND Gates made sense to me.
So I bought a do-jig (can't recall the correct name) that let me wire TTL circuits to see how they worked.
I remember playing with seven segment LED Displays (7447?), 555's/556's.
Never played with CMOS IC's 'cuz I was afraid that I would ZAP THEM and lose my money I paid for those critters.
Yas, I am part Scotch and cheep at that.
Ed
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Hi Ed!

I learned about Logic Gates from reading a Popular Electronics
magazine in the
1970's.
For some reason AND, OR, NOR and NAND Gates made sense to me.
So I bought a do-jig (can't recall the correct name) that let me
wire TTL
circuits to see how they worked.

Correct name might do 'do-flingy'! <g> I (vaguely) recall one Christmas getting a Radio Shack 100-in-1 (or some number) electronics kit: had a
bunch of spring connectors to various components, jumper wires, probably resistors, etc. Recall I'd follow the instructions to build one of
their projects, check out what it did, then swap parts to see what that
did.

I remember playing with seven segment LED Displays (7447?),
555's/556's.
Never played with CMOS IC's 'cuz I was afraid that I would ZAP
THEM and lose
mymoney I paid for those critters.

I don't think I zapped any parts: the manufacturer did than for me! A
lot of my electronics time (at least after the initial learning years)
was repair. Ever see a 7 W resistor glow red? About the diameter of a cigarette and this one was probably 2 to 2.5" long. A filter cap had
failed, dumping all the 'juice' across this resistor and another one
which was about the diameter of a quarter and 1.5" long - value of that
one got altered and so needed replacing. This was in a tube-type amplifier-receiver. My Mother and I noticed something smelt 'warm' but
could figure out where the smell came from. Radio was playing properly,
not from the table lamp.... Finally I came into the room and glanced at
the right time to notice a red glow from inside the amp - that's not
right! ...Dad had me repair (we had the schematic from earlier
repairs) -- what was nice is his attitude was "it's broken so can't make
it much worse" but his Scottish ancestry (his Mother) 'required'
attempting to repair before replacing. I repaired it and I think the
amp lasted another five, maybe ten years.

Yas, I am part Scotch and cheep at that.

I had a friend who said he was part Scotch ..,and part water!

¯ ®
¯ BarryMartin3@MyMetronet.NET ®
¯ ®


... Forecast called for a nip in the air; Scots ran outside, glass in hand!
--- MultiMail/Win32 v0.47
þ wcECHO 4.2 ÷ ILink: The Safe BBS þ Bettendorf, IA

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Hi Ed!

Correct name might do 'do-flingy'! <g> I (vaguely) recall one Christmas getting a Radio Shack 100-in-1 (or some number) electronics kit: had a
bunch of spring connectors to various components, jumper wires, probably resistors, etc. Recall I'd follow the instructions to build one of
their projects, check out what it did, then swap parts to see what that
did.

I don't think I zapped any parts: the manufacturer did than for me! A
lot of my electronics time (at least after the initial learning years)
was repair. Ever see a 7 W resistor glow red? About the diameter of a cigarette and this one was probably 2 to 2.5" long. A filter cap had
failed, dumping all the 'juice' across this resistor and another one
which was about the diameter of a quarter and 1.5" long - value of that
one got altered and so needed replacing. This was in a tube-type amplifier-receiver. My Mother and I noticed something smelt 'warm' but could figure out where the smell came from. Radio was playing properly,
not from the table lamp.... Finally I came into the room and glanced at
the right time to notice a red glow from inside the amp - that's not
right! ...Dad had me repair (we had the schematic from earlier
repairs) -- what was nice is his attitude was "it's broken so can't make
it much worse" but his Scottish ancestry (his Mother) 'required'
attempting to repair before replacing. I repaired it and I think the
amp lasted another five, maybe ten years.

I had a friend who said he was part Scotch ..,and part water!

> <
> BarryMartin3@MyMetronet.NET <
> <

... Forecast called for a nip in the air; Scots ran outside, glass in hand! --- MultiMail/Win32 v0.47
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That ther glowing power resistor was actually doing its job.
It was good whereas the condenser was bad .
But both probably got replaced.
Schematic(s) are a necessity.
Howard Sam's Photofacts save the day.

The device I couldn't name was a plastic piece with holes in it to insert wires or IC pins in .
I know I could get up and grab a old Radio Shack Catalog to see the name of it but just too lazy to stop tapping on this phone to do that.

This Scotchman rather drink RC Cola than alcoholic beverages.

Speaking of Radio Shack, years ago (B4 using phone) I found a URL that had Radio Shack Catalogs images of the pages.
Also found a URL that had Allied Radio Corp. Catalog pages.
I still have my 1959 Allied catalog.
I had seen a 1958 catalog that had a photo of a satellite in a transparent case but when I ordered mine in the Fall of 1958 They mailed a 1959 catalog.
It had Collins Radio "S" Line gear in it .
I think that was the first year Collins sold that series of gear.

Ed
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Hi Ed!

was repair. Ever see a 7 W resistor glow red? About the diameter of a cigarette and this one was probably 2 to 2.5" long. A filter cap had failed, dumping all the 'juice' across this resistor and another one

That ther glowing power resistor was actually doing its job.
It was good whereas the condenser was bad .
But both probably got replaced.
Schematic(s) are a necessity.
Howard Sam's Photofacts save the day.

Yes, I had purchased several Sam's Photofacts: made diagnoses and repair
a lot easier, identified the parts, plus occasionally corrected the manufacture's version. (For those with no history, occasionally the manufacturer would publish an older version of their schematic but sell products which were updated.)

The device I couldn't name was a plastic piece with holes in it
to insert
wiresor IC pins in .
I know I could get up and grab a old Radio Shack Catalog to see
the name of it
but just too lazy to stop tapping on this phone to do that.

"IC socket"?

This Scotchman rather drink RC Cola than alcoholic beverages.

I never drank that much and for some reason after breaking my femur a
few years back I barely drink. No restrictions, just no desire. If I
get offered a glass of wine I'll drink it.

Speaking of Radio Shack, years ago (B4 using phone) I found a URL
that had
Radio Shack Catalogs images of the pages.
Also found a URL that had Allied Radio Corp. Catalog pages.
I still have my 1959 Allied catalog.
I had seen a 1958 catalog that had a photo of a satellite in a
transparent
casebut when I ordered mine in the Fall of 1958 They mailed a
1959 catalog.
It had Collins Radio "S" Line gear in it .
I think that was the first year Collins sold that series of gear.

Their cataloge was handy as a reference: for example (poor one!) I knew
of the 1N4001 -- 50 v PIV -- but my project has a higher voltage.
Initially might think put a few in series to add up the voltages, or
maybe parallel. Ooo! 1N4005 will take care of my problem!


¯ ®
¯ BarryMartin3@MyMetronet.NET ®
¯ ®


... DIODE: What happens to people who don't die young.
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