Muzzle won’t power on

[Rando_calrissian]

I just finished the build but it won’t power on where should I start?

 

[Rando_calrissian]

Pin 5 goes directly to the Collector of Q2.
What voltage is at Pin 8 of LT1054

8.71vdc

 

[Robert]

Pin 5 of the LT1054 should be around -9V.

More importantly, where did you get your THAT4301? That doesn't look like a genuine IC.

 

[Rando_calrissian]

The only place I could find them was eBay could that be causing all the issues?

 

[Robert]

It's very likely.

Just for the heck of it, pull out the THAT4301 and then measure the voltage on pin 5 of the LT1054 again.

 

[Rando_calrissian]

It's very likely.

Just for the heck of it, pull out the THAT4301 and then measure the voltage on pin 5 of the LT1054 again.

Replaced the lt1054 and now I’m getting -6.68v

 

[music6000]

Remove the THAT4301 & see what voltage, you should be getting -9v!

 

[Rando_calrissian]

Remove the THAT4301 & see what voltage, you should be getting -9v!

With the chip pulled it’s -8.35

 

[music6000]

That's more in line with what you are getting at Pin 8 of the LT1054.
What type of Power supply are you using?
THAT4301 seems to be drawing too much voltage!

 

[Rando_calrissian]

Using a planet waves power supply but it seems as though my eBay that4301 is the issue and now I’m having trouble sourcing another

 

[music6000]

What country are you in?

 

[Rando_calrissian]

What country are you in?

United states

 

[Robert]

This is what the THAT4301 should look like. They're out of production and have become pretty hard to find over the past year.

 

[Rando_calrissian]

From all my searching it doesn't look like I can get any at this time

 

[Rando_calrissian]

From all my searching it doesn't look like I can get any at this time

Saw some post about alibaba clones that work but you have to order a minimum of 5 at 17 dollars each

 

[music6000]

I have used this site & Hector has always sent genuine parts.
Contact him to send a picture to be sure!

THAT4301P20-I / THAT 4301 That Corp.,DIP20.

THAT4301P, THAT Analog Engine® IC Dynamics Processor. ThatCorp, DIP20

www.retroamplis.com

 

[music6000]

Try this first, There in your country :

Buy Electronic components,IC chips,Module,Darlington, Capacitor, find chips, diode, Transistors, Sensors, IGBT at Utsource.

UTSOURCE is a professional purchasing B4B & B4C tools in electronic components field. UTSOURCE.net provides different types such as IC, Modules, RF transistors etc., and various product type's PDF parameter form as well as the relevance photographs, we also provide satisfying one-stop package...

www.utsource.net

 

[Rando_calrissian]

I have used this site & Hector has always sent genuine parts.
Contact him to send a picture to be sure!

THAT4301P20-I / THAT 4301 That Corp.,DIP20.

THAT4301P, THAT Analog Engine® IC Dynamics Processor. ThatCorp, DIP20

www.retroamplis.com

That’s 30 dollars is without shipping

 

[Rando_calrissian]

Bit the bullet and it finally arrived but I’m still having issues the voltages are as follows ic1 tc1044

1-8
8.7,5.03,0,-3.313,-7.98,3.988,5.511,8.70

ic 2 that4301
1-20
0
.036
0
-.069
.885
0
-.439
0
0
-7.89
8.7
-0.002
0
-.440
-.440
0
.002
2.552
.001
0

Ic3 tl072cp
1-8
.005
.005
0
-7.89
.001
.001
.001
8.71