25-03-2018, 10:58 AM
Hi Steve
Thanks for the documents, they are very good quality scans.
I note that the front porch in the days of 5:4 were quite short 0.5 uS aprox. also the introduction of pedestal in 1956.
Hi Trevor
Some good points there you cant beat another set of eyes looking at something.
The MC44BS373 are great modulators and not having direct access to them is certainly a disadvantage, an extra phono connector or switch either electronic or mechanical would have sorted that out. Not having an external audio gain control was an oversight. To have one would just have meant a slight PCB change and fitting a vertical rather than a horizontal preset.
One great thing about building your own is you can build whatever way that suits yourself the best.
I think it very unlikely that any commercial design would use toggle switches as the cost is too high. A 10 pole DIP switch would cost less than half of one toggle switch. There is also the extra costs of larger PCB and case needed to accommodate them, probably would cost more to assemble and possibly larger delivery costs. Which all adds up to make it not viable.
I was thinking afterwards that I could have fitted a LCD display and push switches for less. I still prefer the toggle switches.
Frank
Thanks for the documents, they are very good quality scans.
I note that the front porch in the days of 5:4 were quite short 0.5 uS aprox. also the introduction of pedestal in 1956.
Hi Trevor
Some good points there you cant beat another set of eyes looking at something.
The MC44BS373 are great modulators and not having direct access to them is certainly a disadvantage, an extra phono connector or switch either electronic or mechanical would have sorted that out. Not having an external audio gain control was an oversight. To have one would just have meant a slight PCB change and fitting a vertical rather than a horizontal preset.
One great thing about building your own is you can build whatever way that suits yourself the best.
I think it very unlikely that any commercial design would use toggle switches as the cost is too high. A 10 pole DIP switch would cost less than half of one toggle switch. There is also the extra costs of larger PCB and case needed to accommodate them, probably would cost more to assemble and possibly larger delivery costs. Which all adds up to make it not viable.
I was thinking afterwards that I could have fitted a LCD display and push switches for less. I still prefer the toggle switches.
Frank
