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Old 24th November 2010, 08:32 PM   #11
M Gregg is offline M Gregg  United Kingdom
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Relay driver and selector board installed. Indicator (Glass diamond colour change for each input).
Test of driver board EM80.
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Old 24th November 2010, 08:35 PM   #12
M Gregg is offline M Gregg  United Kingdom
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Driver board and EM80 test
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Old 24th November 2010, 08:41 PM   #13
M Gregg is offline M Gregg  United Kingdom
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ECC88 Aikido section in place with 350V to 250V regulator. Inverter section installed with soft start, DC heaters lifted using Recom inverter isolation. Staged heater start circuit with current limit and thermal "solid state fuses". HT switched from heater circuit by Triac.
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What is the sound of one hand clapping?

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Old 24th November 2010, 08:50 PM   #14
M Gregg is offline M Gregg  United Kingdom
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Completed project. Input voltage 19V DC.
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What is the sound of one hand clapping?

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Old 24th November 2010, 09:08 PM   #15
Bigun is offline Bigun  Canada
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Looks fantastic ! - schematics ?
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Old 24th November 2010, 09:16 PM   #16
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Quote:
(Glass diamond colour change for each input)
What's all that about?
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Old 24th November 2010, 10:08 PM   #17
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Soonerorlater View Post
What's all that about?
The input selector uses a decade counter with debounce circuit, this drives the relays on the input board. Each output from the decade counter drives a different colour LED all mounted under the glass diamond on the front. So you can link the colour to the input selected. IE green Ipod, yellow CD, red tuner, ect. Just a bit of fun the glass changes colour.


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Old 24th November 2010, 10:14 PM   #18
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Bigun View Post
Looks fantastic ! - schematics ?
Thank's for the kind comments!
I must admit I tend to pick up a piece of Glass fiber strip board and with a pencil and paper sketch the circuit and build. I will look at putting some circuits down on paper and posting some of the schematics and links I used.

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M. Gregg
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Old 26th November 2010, 05:13 PM   #19
M Gregg is offline M Gregg  United Kingdom
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OK.

I have "created in p. point and converted to jpeg" the input selector section schematic.
I must admit I don't know why anyone would use a rotary switch when you can position a single push button any where on the chassis and have the relay board next to the phono socket inputs. The 18K for the reset is not critical, however if the value is to high or low it will effect the current drain from the chip or not allow a "0" for the count. The 0.1uf from supply to reset ensures that the selector always starts at output "0". It is easy to modify for as many inputs as required!You could use output "0" as mute at start and move the inputs to output 1,2,3,4 etc.

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M. Gregg
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Old 11th December 2010, 03:38 PM   #20
M Gregg is offline M Gregg  United Kingdom
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Sorry,

I said I would post some of the circuits.
Here is the HT inverter it is very simple and with a filter it powers the Aikido section the regulator and the EM80's. I found it interesting because it uses a Tx that is easy to make. Also it does not supply HT if no load is connected, so a heater failure turns off the HT.
Wind the HT coil first then insulate with tape and wind LT on top(Spread the windings across the Bead)!
Don't be tempted to "bolt through the bead with a steel pin" to secure it! Use a plastic pin or tyrap.
I know some people will say "regulation". It works well for me there is more noise from the regulator than the inverter! (mV)


The Inverter circuit was modified from this link. I found the reg they used to be of little use! Shorts take out the transistor. The one further back in the post Maida works well!

Inverter HT PSU


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M. Gregg
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File Type: jpg Inverter circuita.jpg (31.5 KB, 244 views)
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