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Old 9th June 2012, 03:29 PM   #51
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by abraxalito View Post
I too am nonplussed. The electronics magazines I devoured almost every month in the early and mid 70s probably have few parallels today - Everyday Electronics, Practical Wireless, Practical Electronics, ETI, Wireless World, Elektor.

I was introduced to electronics at school by a teacher who kept a kit in the classroom. Every Wednesday afternoon we were given the choice of which 'toy' to play with, I mainly gravitated towards building a crystal radio. I recall spending considerable time trying to get my head around how 3 legged transistors (black painted glass, so perhaps OC71s) decided how to divide up the current between those 3 wires. In comparison, diodes and resistors were pretty straightforward. This would've been around age 10 or 11.
Yes, I remember the cross section of books and the drive to build your own...
Looking in the magazine shops now its a bit thin on the ground... Ahh yes the Van de Graaff generator....also spawned a pop group..Yes the local Physics teacher who let me borrow a variable power resistor and a few bits and pieces..also access to a scope....

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M. Gregg
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Old 9th June 2012, 04:19 PM   #52
M Gregg is offline M Gregg  United Kingdom
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I must add,

I went to see my friend who went to work for the BBC, At his house...He had built a microphone preamp that was very sensitive...(He lived next to the local park)
He said watch this there are some girls I know over their..I looked I could just see them...He got a glass bowl off the table and said turn the amp up..he moved the mic in front of the bowl with the window open..Then the sound of birds and cars going by and Talking...what....yes the girls we could hear everything they were saying...so you can see why he was destined for the BBC...we were only 15..

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M. Gregg
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Old 9th June 2012, 05:36 PM   #53
popilin is offline popilin  Argentina
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Quote:
Originally Posted by M Gregg View Post
Yes, I remember the cross section of books and the drive to build your own...
Looking in the magazine shops now its a bit thin on the ground... Ahh yes the Van de Graaff generator....
I remember the Van der Graaf generator in the lab, and Leyden jars, made of glass vessels and aluminum foil.
It was cold, and go unnoticed, the thick gloves of a fellow.
He charged the Leyden jars, and threw them to us, then understood what his gloves.
Curiously no one dropped to the floor.
Another fellow had a very pointed nose, got too close to the generator...edge effect.
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Old 9th June 2012, 06:06 PM   #54
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by popilin View Post
I remember the Van der Graaf generator in the lab, and Leyden jars, made of glass vessels and aluminum foil.
It was cold, and go unnoticed, the thick gloves of a fellow.
He charged the Leyden jars, and threw them to us, then understood what his gloves.
Curiously no one dropped to the floor.
Another fellow had a very pointed nose, got too close to the generator...edge effect.
LOL..
Spark erosion
The new cosmetic nose treatment..

I remember in the first year of college one guy stayed out late at night all the while so was always falling to sleep in the lessons...He jumped up on the bench and dozed off as the lecturer was talking ...OWWWWWWWWWWWWWWWWW he shot off the bench..sat on a soldering iron and the lecturer had reset the safety..it burned right through his trousers before he woke up...

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M. Gregg
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What is the sound of one hand clapping?

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Old 9th June 2012, 07:26 PM   #55
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Quote:
Originally Posted by DF96 View Post
I'm puzzled. I would have thought that in those days it was a lot easier to learn about electronics than today. That is when I learnt about electronics. School maths and science were at a higher standard than today, so the prerequisites for electronics were in place.
Right. Also I did not have parts to build something, so I was spending evenings is a public library reading Radio magazines, from 30'th to 60'th ears. Reading and drooling, dreaming to have all that parts.

Then I bought a vacuum tube reference book and a book of schematics of transistor receivers. They were my main books for several years, until I graduated the school.

But when I graduated the school I already knew how to fix radios, TVs, tape recorders. I have built transistor amp for bass guitar and tube amp for lead guitar (with Gu-50 outputs, by the way), and many guitar effects.
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Last edited by Wavebourn; 9th June 2012 at 07:29 PM.
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Old 10th June 2012, 01:35 PM   #56
M Gregg is offline M Gregg  United Kingdom
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The next build,

Talking to people, discussion went like this," I think I would go all cassette tape because they are easier to store than LP's".

So I looked around and bought a Monolith Magnetics cassette transport...This became a challenge with NAB tape EQ and the pre section was a real pain to get working without hum...don't know why but I thought it would just be as simple as RIAA pre amp topology..Was I wrong..

I managed to get a Dolby module that was available at the time from Maplin..Built a discreet component dual bar graph for the output power (no chips)In Practical wireless at the time, Bass & treble controls and again LM381a pre section built on an RS PCB...Polycarbonate coupling caps...Help from electronic engineers I worked with at the time..

Toroid power and separate Regulators for the PSU dual reg for the NAB pre section to get the noise down..Circuit board made for TIP41a<<my favorite at the time..power section 25W per channel..I was 18..Aux Input soon put in to connect the record deck that I could not live without...

I do cringe now when I think about all the tubes that became bombs out of the bedroom window when I was 9..LOL...

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M. Gregg
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What is the sound of one hand clapping?

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Old 10th June 2012, 02:19 PM   #57
M Gregg is offline M Gregg  United Kingdom
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What happened to the good old days?

Pull out freebies:

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M. Gregg
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Old 14th June 2012, 04:43 AM   #58
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I assembled a whistle tuned switch from a monthly magazine sold here.

The PCB was made by cutting thin brass plates according to the tracks and sticking it on a laminate used in carpentry. It used 741s and it was working.

Gajanan Phadte
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