15-11-2022, 10:44 PM
Things have moved on a bit, I have a stage with EF91, ECC83 and two EC90's driving the mod transformer from the above circuit.. i still have to add a bit to the circuit, as in a LDR, two LEDS and two Zener's and a few resistors to provide a form of level control, that lot courtesy of discussions on the other forum.
I am not sure if the mod stage will actually work in real life, but it is fun building and trying things out.
It is being powered by 12 Volt to 250 and 6.3 V switching PSU's while I play, the end idea was to mod a small valve 5 Watt TX for either 80 or 40 metres, which I would still have to build.
This is the circuit so far before the compression bits are added.
modstage017.pdf (Size: 43.44 KB / Downloads: 13)
I learn from building and figuring so for me it is good.
Adrian
I am not sure if the mod stage will actually work in real life, but it is fun building and trying things out.
It is being powered by 12 Volt to 250 and 6.3 V switching PSU's while I play, the end idea was to mod a small valve 5 Watt TX for either 80 or 40 metres, which I would still have to build.
This is the circuit so far before the compression bits are added.
modstage017.pdf (Size: 43.44 KB / Downloads: 13)
I learn from building and figuring so for me it is good.
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve
