Maplin Electronics Magazines
the_constructor
magazines.
If you have them and would like to let them go, please PM me.
Jim
John Whitworth
"the_constructor" <the_con...@freeukisp.co.uk> wrote in message
news:DKmdnfL-nNJsAIvR...@brightview.co.uk...
I used to love Electronics mags and the likes (no - pornos came later) in
those days. I think I had (now long gone) some of the Maplin Projects books,
with such projects as the Acoustic Coupler modem and the SP0256 speech
synthesizer module.
Steve Terry
news:4c16b5fc$0$28001$db0f...@news.zen.co.uk...
introduce the wonderful MD108 Schottky diode ring mixer, which became
the basis of RX 1st mixers and DSB / SSB TX balanced mixers.
Steve Terry
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Dave Plowman (News)
Must you have them in the flesh? I'd be surprised if they weren't
available in an electronic form somewhere.
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Brian Gregory [UK]
news:hv6d7b$j8i$1...@news.eternal-september.org...
> "John Whitworth" <sexyjw@g_EEEEEEEEEEEEEEEE_mail.com> wrote in message
> news:4c16b5fc$0$28001$db0f...@news.zen.co.uk...
>> "the_constructor" <the_con...@freeukisp.co.uk> wrote in message
>> news:DKmdnfL-nNJsAIvR...@brightview.co.uk...
>>> I am looking to purchase the first 8 copies of the Maplin Electronics
>>> magazines.
>>> If you have them and would like to let them go, please PM me.
>>> Jim
>>
>> I used to love Electronics mags and the likes (no - pornos came later) in
>> those days. I think I had (now long gone) some of the Maplin Projects
>> books, with such projects as the Acoustic Coupler modem and the SP0256
>> speech synthesizer module.
>>
> It's R&EW is miss with it's Ambit kits, They must have been the first to
> introduce the wonderful MD108 Schottky diode ring mixer, which became
> the basis of RX 1st mixers and DSB / SSB TX balanced mixers.
Same here. I really really wish I'd realized Ambit were struggling and
stocked up on Toko coils, ceramic filters etc. etc. before they disappeared
altogether.
--
Brian Gregory. (In the UK)
n...@bgdsv.co.uk
To email me remove the letter vee.
Steve Terry
news:pNidnZYpZZgoSYvR...@pipex.net...
>
>
http://www.jabdog.com/Filters.htm
http://www.jabdog.com/toko-10k.htm
Ambit became Cirkit Distribution Ltd., Park Lane, Broxbourne, Herts.
EN10 7NQ Tel 01992 448899
(no idea if they are still going?)
Seems main toko coil supplier now is
http://www.bec.co.uk/
Others worth a look at:
http://www.cricklewoodelectronics.com
http://www.surplectronics.com/
http://www.bowood-electronics.co.uk/
http://www.rapidonline.com/
http://www.cirkitelectro.com/
and of course RS, CPC/Farnell
Article on rewinding Toko 10k coils
http://g4hup.com/DFS/Rewinding%20Toko%2010k%20Series%20Coils.pdf
luc...@eternal-flames.gov
wrote:
>It's R&EW is miss with it's Ambit kits, They must have been the first to
>introduce the wonderful MD108 Schottky diode ring mixer, which became
>the basis of RX 1st mixers and DSB / SSB TX balanced mixers.
MD105s are still about. But it's been a while since I've seen any
SBL-1s advertised.
Nick
luc...@eternal-flames.gov
>MD105s are still about. But it's been a while since I've seen any
>SBL-1s advertised.
>
>Nick
Should read MD108 not 105.
Bruce
<da...@davenoise.co.uk> wrote:
>In article <DKmdnfL-nNJsAIvR...@brightview.co.uk>,
> the_constructor <the_con...@freeukisp.co.uk> wrote:
>> I am looking to purchase the first 8 copies of the Maplin Electronics
>> magazines.
>
>> If you have them and would like to let them go, please PM me.
>
>Must you have them in the flesh? I'd be surprised if they weren't
>available in an electronic form somewhere.
Sounds like a collector to me.
Jeff
Mini Circuits still make the SBL-1+. Anzac were taken over many moons
ago by M/Acom, who in turn were taken over by Tyco. They did keep the
MD-108 going for a while but it finally vanished some years ago.
Jeff
pete
the codes for each phoneme (?) in sequence it sounded a lot like a baby
learning to talk.
Now look what you made me do .... I had to pop up to the loft. I still have
project book #4 (frequency counter) and #20 (WX sat decoder, now replaced by
software).
Hmmm, that infra-red proximity detector looks intersting, might have a bash ...
John Rumm
Alas dispensed with my copies a few years back...
--
Cheers,
John.
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| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/
dave
> It's R&EW is miss with it's Ambit kits, They must have been the first to
> introduce the wonderful MD108 Schottky diode ring mixer, which became
> the basis of RX 1st mixers and DSB / SSB TX balanced mixers.
It was the very best of electronic magazines I have ever come across. I
taught me a hell of a lot. One thing I will never forget was the article
about frequency synthesis. The picture of a bird swallowing pulses from
the stream will live with me for ever.
I wish I had saved more content for archives though.
Dave
Steve Terry
news:OrGdnSGCV-C0LorR...@bt.com...
generator to substitute for Xtals.
When i later worked on Tate T500 PBR mobiles, their MC145152
dual modulas version of MC145151 PLL were already second nature to me.
luc...@eternal-flames.gov
> Mini Circuits still make the SBL-1+. Anzac were taken over many moons
>ago by M/Acom, who in turn were taken over by Tyco. They did keep the
>MD-108 going for a while but it finally vanished some years ago.
>
>Jeff
I bought a couple of SBLs back in the Early 80s - from Cirkit in fact.
I used one in a new mixer stage I built for a much modified HW-7 - it
did a fantastic job on the microphonics that tcvr was prone to.
The other one is still in its original packing and I'm sure I'll get
around to using it one day ... even if I haven't in the last 25+
years. :-)
Nick.
Brian Gregory [UK]
news:20100615085...@peterson.fenrir.org.uk...
> On Tue, 15 Jun 2010 03:58:37 +0100
> "Steve Terry" <gfou...@tesco.net> wrote:
>
>> Seems main toko coil supplier now is
>> http://www.bec.co.uk/
>
Yes they have the main ones useful for simple hom brew QRP HF transmitters
and receivers.
--
Brian Gregory. (In the UK)
Brian Gregory [UK]
Oh yes, I remember now,
I was actually thinking of when Cirkit disappeared.
> Seems main toko coil supplier now is
> http://www.bec.co.uk/
>
> Others worth a look at:
> http://www.cricklewoodelectronics.com
> http://www.surplectronics.com/
> http://www.bowood-electronics.co.uk/
> http://www.rapidonline.com/
> http://www.cirkitelectro.com/
>
> and of course RS, CPC/Farnell
>
> Article on rewinding Toko 10k coils
> http://g4hup.com/DFS/Rewinding%20Toko%2010k%20Series%20Coils.pdf
Some excellent information there.
Many thanks.
--
Brian Gregory. (In the UK)
John Whitworth
"pete" <no-...@unknown.com> wrote in message
news:slrni1ehhl...@corv.local...
> On Tue, 15 Jun 2010 00:06:32 +0100, John Whitworth wrote:
>>
>>
>> "the_constructor" <the_con...@freeukisp.co.uk> wrote in message
>> news:DKmdnfL-nNJsAIvR...@brightview.co.uk...
>>> I am looking to purchase the first 8 copies of the Maplin Electronics
>>> magazines.
>>>
>>> If you have them and would like to let them go, please PM me.
>>>
>>> Jim
>>
>> I used to love Electronics mags and the likes (no - pornos came later) in
>> those days. I think I had (now long gone) some of the Maplin Projects
>> books,
>> with such projects as the Acoustic Coupler modem and the SP0256 speech
>> synthesizer module.
>>
> Hey I built that speech synth (still have it somewhere). If you just sent
> the codes for each phoneme (?) in sequence it sounded a lot like a baby
> learning to talk.
Excellent, wasn't it? I linked it up to my Dragon 32 computer, and had to
get it to speak via multiple POKE commands in BASIC. Didn't even know what
an API was in those days.
JW
Nige Danton
<see.my.s...@nowhere.null> wrote:
>On 14/06/2010 22:23, the_constructor wrote:
>> I am looking to purchase the first 8 copies of the Maplin Electronics
>> magazines.
>>
>> If you have them and would like to let them go, please PM me.
If digital copies ok then it's worth checking Scribd.
www.scribd.com
--
Nige Danton
email: swop the obvious for g_m_a_i_l
--- news://freenews.netfront.net/ - complaints: ne...@netfront.net ---
John Rumm
I built one for my VIC-20 from the Maplin kit. The interface was
slightly odd I seem to recall[1] in that it used a bank of memory mapped
registers, but the actual content of the write to any given register was
generally irrelevant - each allaphone was selected by writing to its own
unique register, and the write address strobe was what actually kicked
it off.
So rather than the more expected :
POKE allaphone_reg, allapone_id
You had something like:
POKE synth_base_adr + allaphone_id, 1
Followed by a wait on busy for the sounding of the allaphone to complete
before loading the next one.
[1] Probabbly designed to use less decoding and steering logic that way.
John Whitworth
"John Rumm" <see.my.s...@nowhere.null> wrote in message
news:faadnT54buvKfIXR...@brightview.co.uk...
Blimey - long time ago - but a quick Google confirms you are right. Each of
the 256 allaphones (just the term was a trip down memory lane) effectively
had it's own 8-bit memory address
(http://courses.cit.cornell.edu/ee476/Speech/SPO256-AL2.pdf).
With honest hindsight, I think my "excellent" description is really more
about the geeky satisfaction of something that I gave birth to (yeah yeah -
OK - soldered together manufactured parts!) saying "Hay-low Joh-hnnn". The
fact that this also somehow occurred due to a complete hack around of my
Dragon Data Asteroids cartridge with the ROM chip removed probably pleased
me even more. Yeah - everything was done on the cheap then. And people
wonder why we get less inventive as we age! :-)
John Whitworth
<luc...@eternal-flames.gov> wrote in message
news:hpef16t14gk96ee4a...@4ax.com...
I bought some new-old AC128 transistors about 6 months ago. I'll probably
still have them in the same state in 25+ years! ;-)
John Rumm
Cor, wish I had had that data sheet at the time - lots more detail that
what they reprinted in the maplin mag.
> With honest hindsight, I think my "excellent" description is really more
> about the geeky satisfaction of something that I gave birth to (yeah
> yeah - OK - soldered together manufactured parts!) saying "Hay-low
> Joh-hnnn". The fact that this also somehow occurred due to a complete
Oh indeed. I was just having a geeky revel in the fact that I can still
remember how to program the thing even though I probably last wrote code
for it prior to 1986! ;-)
> hack around of my Dragon Data Asteroids cartridge with the ROM chip
> removed probably pleased me even more. Yeah - everything was done on the
> cheap then. And people wonder why we get less inventive as we age! :-)
Yup, different world these days, and not quite as much fun.
Brian Gregory [UK]
Surely it depends how you wire up the chip to the processor buses.
> With honest hindsight, I think my "excellent" description is really more
> about the geeky satisfaction of something that I gave birth to (yeah
> yeah - OK - soldered together manufactured parts!) saying "Hay-low
> Joh-hnnn". The fact that this also somehow occurred due to a complete hack
> around of my Dragon Data Asteroids cartridge with the ROM chip removed
> probably pleased me even more. Yeah - everything was done on the cheap
> then. And people wonder why we get less inventive as we age! :-)
--
John Rumm
Well sort of, in the sense that you *could* do it differently, but you
would be swimming against the tide since you would need to include extra
external buffers to provide a register which you could write to, which
in turn would gennerate an address pattern for the device. Since you
would also need chip select decoding logic for your buffer, it would be
simpler to just miss out the middle man, dispense with the buffer, and
have it pick the required address up straight off the least significant
6 bits of the main address bus.
Brian Gregory [UK]
All you have to do is wire those pins to the data bus instead of the address
bus.
Just becasue they're named An on the data sheet it doesn't mean the only way
to use them is to wire them to the address bus.
They're called An because they address different bits of ROM in the SP0256,
not because they're intended to be wired to the processor's address bus.
John Rumm
You could, but it makes it no simpler to address. You would still need
some address decoding to provide chip selects for the device, and now
you also need data bus interaction. That potentially makes for even more
decoding with processors that use multiplexed address and data busses.
> Just becasue they're named An on the data sheet it doesn't mean the only way
> to use them is to wire them to the address bus.
Never said it was - its just the simplest way to interface this
particular device - give it a slab of IO or memory address space.
Brian Gregory [UK]
Just more conventinal.
> You would still need some address decoding to provide chip selects for the
> device, and now you also need data bus interaction. That potentially makes
> for even more decoding with processors that use multiplexed address and
> data busses.
The logic to demultiplex any combined address/data bus would probably
already be present.
Anyhow we're discussing a VIC-20 implementation and that was 6502 based
without a multiplexed bus in sight.
>> Just becasue they're named An on the data sheet it doesn't mean the only
>> way
>> to use them is to wire them to the address bus.
>
> Never said it was - its just the simplest way to interface this particular
> device - give it a slab of IO or memory address space.
What was all that stuff you said about needing a buffer to write to then?
Anyway I've never seen anybody do an 8 bit output port where the data comes
off the address lines before.
John Rumm
Agreed.
>> You would still need some address decoding to provide chip selects for the
>> device, and now you also need data bus interaction. That potentially makes
>> for even more decoding with processors that use multiplexed address and
>> data busses.
>
> The logic to demultiplex any combined address/data bus would probably
> already be present.
quite possibly...
> Anyhow we're discussing a VIC-20 implementation and that was 6502 based
> without a multiplexed bus in sight.
Indeed, although the device was not designed exclusively for use on 6502
systems.
>>> Just becasue they're named An on the data sheet it doesn't mean the only
>>> way
>>> to use them is to wire them to the address bus.
>>
>> Never said it was - its just the simplest way to interface this particular
>> device - give it a slab of IO or memory address space.
>
> What was all that stuff you said about needing a buffer to write to then?
That you would probably need one or more in order to create a more
traditional interface to it...
Having said that, looking at the design (of the Maplin VIC-20 Talkback
project[1]) they have used a latch anyway just to avoid a race hazard on
sampling the address bus.
> Anyway I've never seen anybody do an 8 bit output port where the data comes
> off the address lines before.
Well they have not done it here either - its just memory mapped with
each memory location accessing a different special function register.
By sticking it on the cartridge expansion port they also made use of one
of the standard io bank enable chip selects to avoid doing their own
address decoding. Since this is active for a reasonable slab of address
space, I would guess they were hence not worried about the memory footprint.
Their design is somewhat kludgy it has to be said. The busy detection in
particular was pretty lame (being wired round to the joystick port as a
discrete input).
[1] Original circuit diagram for it:
http://www.nemetzpower.de/Forum64/VIC20Talk.pdf
clonet
"Bruce" <docne...@gmail.com> wrote in message
news:sobe169aga0lfb09p...@4ax.com...
Could be a base or emitter though.
Bob Eager
That must be the source of me laughing like a drain, then.
--
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John Rumm
> On Tue, 22 Jun 2010 10:57:04 +0100, John Rumm
> <see.my.s...@nowhere.null> wrote:
>
> [long list of quotes snipped]
>
>> Their design is somewhat kludgy it has to be said. The busy detection in
>> particular was pretty lame (being wired round to the joystick port as a
>> discrete input).
>>
>>
>> [1] Original circuit diagram for it:
>>
>> http://www.nemetzpower.de/Forum64/VIC20Talk.pdf
>
> newsgroup, where it has no relevance whatsoever.
>
> Thank you.
I suspect the conversation is over anyway. So you can go back to your
regular drivel.