On A Hippie Trail, Head Full Of Zombie

[tubesguy]

This was a personal project I worked with JPS on.

It's nice to have friends. I'll be following this thread ... an F7 is my New Year resolution.

 

[codyt]

It's nice to have friends. I'll be following this thread ... an F7 is my New Year resolution.

Same. Looking forward to an F7 build 😀

 

[2 picoDumbs]

I have been using these thermistors.
A bit more beastly than CL60 and a little softer start up against inrush currents.

 

[Zen Mod]

ever seen one used in XA25?

 

[Dennis Hui]

Oh yeah, that one is a beast.

 

[2 picoDumbs]

ever seen one used in XA25?

I think the XA25 ones might be even more beastly than these ones.
I started using these ones before XA25 was out. I might have tried those if I had known about them before I started using these ones.

Either way these are definitely more robust than CL60.

 

[2 picoDumbs]

Some progress.

Debating whether to actually insert polypropylene caps on the board (c123, c124) or not worry about them.

Edit: I will run without, and maybe add later.

 

[TungstenAudio]

Well, if nothing else, those big box caps will certainly look cool...

 

[2 picoDumbs]

I have 3 of those but can't find the 4th one.

 

[coolnose]

Not sure you have enough pcb though...

 

[2 picoDumbs]

They just fit, but I am not going to bother with it for now.

 

[TungstenAudio]

Looks like you are staying with the standard FirstWatt power supply voltages. Bleeder resistors are only 2.2k 😉

 

[2 picoDumbs]

I have 2 x 500VA transformers that have dual 19V and 25V taps on the secondaries.

On one channel going with 19V taps, that should give me around 25V rails, on the other channel I will use the 25V tap and maybe go regulated or cap multiplier, rail voltages to be decided depending on whether I go regulated or cap multiplier.

Then compare the two.

 

[jwjarch]

Why go with 2 different PSU types pico? Experiment?

For cap multiplier I can highly recommend the simple boards that Prasi did with the gtose/mark johnson design. I'm using those on an F7 "clone" right now. ZERO noise or hum. Transformers are Antek 200VA 22V. I'm getting +/- 24.5V DC after the cap multipliers with the amp turned on.

 

[2 picoDumbs]

Why go with 2 different PSU types pico? Experiment?

Experimenting is the name of the game.

I will be doing my own regulator or cap multiplier.

 

[jwjarch]

Can’t wait to see it all unfold!

 

[El Reino]

Can’t wait to see it all unfold!

+1

 

[2 picoDumbs]

One supply done.
CCCCRCCCC

 

[TungstenAudio]

Yeah, it really needs a pair big red block caps. Just doesn’t look finished without them.

 

[2 picoDumbs]

These aren't soldered in yet. Just for illustration purposes.
I can only find 3 so may even decide on something different.

I will solder all wiring first then caps last if I decide to add them.