You can see my full build thread HERE
There are two awesome TTSH threads in Muffs.
2600 clone - Two Thousand Six Hundred (TTSH)
and
Two Thousand Six Hundred (TTSH) Project General Build Thread
The DSL-Man site has a very good TTSH thread
And of course the official build thread is here
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The 4027-1 was an improved design over the original ARP 4017/4027 VCO's
The TTSH 2047-1 module is pretty straight forward to put together except for
though those pesky SMD caps. They are tiny and one gave me a headache when it decided to fly off my tweezers onto the floor.
This is a packet of six 100n SMD caps viewed against a Australian 20 cent piece.
Pointless trying to find it. A new order from mouser beckons.
Half way there
1k87 Tempco Resistor.
One finished sub module.... two to go.
As a comparison, I'd thought it would be nice to see the TTSH 2047-1 against a original ARP 2047-1 sub module. This is a spare I have left over from a earlier restoration of a vintage 2600.
The original ARP (like the TTSH version) used three of these 2047-1 submodules. The rest of the VCO circuit is on the main PCB.
The modern TTSH 2047 uses a 3046 IC. The vintage a CA3086 IC
The CA3046 transistor arrays consists of five general purpose silicon NPN transistors. Two of the transistors are internally connected to form a differentially connected pair.
The CA3086 transistor arrays also consists of five general-purpose silicon NPN transistors. We also have two of the transistors internally connected to form a differentially connected pair.
The pin outs of both look the same.The CA3046's probably have closer tolerances
than the older CA3086, however I wonder if CA3086’s can be used (if you can find them)?
than the older CA3086, however I wonder if CA3086’s can be used (if you can find them)?
The vintage 4027-1 PCB:(It's a work of art).
The article is much informative which i was searching for .Nice intro good explanation thanks for sharing.
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