Simulcast IC—is it a charge pump? And which type?

[farwest1]

Hi all, I'm assembling my parts list for the Simulcast. This one has been a bit of a hunt.

The last thing I need is IC1 LT1054. I can get one on Amazon for $16 but it takes until April to arrive.

Or I can order one from Mouser for $3. Does it matter if it's LT1054IP or LT1054CP? Both seem to accept input 15V and output 5V. Is that right?

 

[twebb6778]

Get the TC1044S from Tayda and bridge the pads on the pcb that say 1044.

TC1044SCPA TC1044 Voltage Regulator IC

MICROCHIP - Get It Fast - Same Day Shipping

www.taydaelectronics.com

 

[farwest1]

Get the TC1044S from Tayda and bridge the pads on the pcb that say 1044.

TC1044SCPA TC1044 Voltage Regulator IC

MICROCHIP - Get It Fast - Same Day Shipping

www.taydaelectronics.com

Thanks! I assume I just bridge them with a piece of solid wire? They're very small and close together.

What does bridging and then using a 1044 do different than tracking down a 1054?

 

[Nostradoomus]

Pins 1-8 are setup to boost the oscillation frequency above the human range of hearing when they are tied together. The LT1054 doesn’t have that feature.

And yeah just lay a solder blob across them!

 

[Robert]

Another one I was just made aware of is the TC7660HEPA.

It doesn't need the jumper and runs at 125kHz, so is far out of the audible range. (vs 25kHz / 45kHz in the usual suspects)

 

[Nostradoomus]

And it filters the air around it!

 

[farwest1]

One other question! C4 calls for a 35v 120uf capacitor.

I have a 63v 120uf capacitor. Would it matter if I put the one in with the higher voltage?

 

[Nostradoomus]

Nope, that’s fine. If it fits use it!

 

[farwest1]

Ok, almost done with the board!

I find myself without a 450R resistor at r12. Is there another value I could swap out? Something fairly common?

Also, for the 100uF at c11, I only have a 16v 100uF Aishi. Will that work?

Thank you!

 

[Nostradoomus]

Anything close to 450r is fine. 470, 510 etc.

 

[farwest1]

Anything close to 450r is fine. 470, 510 etc.

I have a 390R.

 

[Nostradoomus]

That should work too

 

[farwest1]

welp, I thought I was done, but then noticed that I was about to install a B250K pot instead of a B25K pot. Ooops!

And the B25K pots are surprisingly hard to source. Is there an alternative? B50K? Thank you!

 

[Robert]

25K OHM Linear Taper Potentiometer PCB Mount Round Shaft Dia: 6.35mm

ALPHA - Get It Fast - Same Day Shipping

www.taydaelectronics.com

 

[zgrav]

if you don't already have a spare, order an extra charge pump or two while you're at it.

 

[PedalBuilder]

Another one I was just made aware of is the TC1044HEPA.

It doesn't need the jumper and runs at 125kHz, so is far out of the audible range. (vs 25kHz / 45kHz in the usual suspects)

Do you know of a source for the TC1044HEPA? This page was the only result when I googled it.

 

[Robert]

Do you know of a source for the TC1044HEPA? This page was the only result when I googled it.

My apologies, it was the TC7660HEPA. (not TC1044)