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Author Topic: Pentawatt layout TDA2030A and TDA2050 etc  (Read 18042 times)

jfetter

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Pentawatt layout TDA2030A and TDA2050 etc
« on: January 30, 2007, 10:39:33 AM »
Anyone have the Orcad 'layout' library for the Pentawatt (TDA2030A and TDA2050). I have the schematic 'Capture' library from ST, no footprints though.

Thanks
 

jfetter

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #1 on: February 14, 2007, 09:38:42 PM »
Here is a footprint for the tda2050V (vertical mnt)

jfetter

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #2 on: March 03, 2007, 12:29:56 PM »
Here is the prototype TDA2050 and jfet preamp. The power amp supplies 24vdc to preamp. Design is single supply +40vdc with an output network that soft clips. The TDA2050 case can be mounted to gnd potential panel. No clipping diodes are in the system.

teemuk

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #3 on: March 03, 2007, 12:37:30 PM »
Can't see the links...?

joecool85

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #4 on: March 04, 2007, 07:17:28 AM »
No links teemuk, he attatched pics.

Looks good btw.
Life is what you make it.
Still rockin' the Dean Markley K-20X
"New" amp: Fender Frontman 25 DSP (FM25DSP)
thatraymond.com

teemuk

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #5 on: March 20, 2007, 10:39:35 AM »
Well, I can't see the pics either. In none of the threads here. Apparently they show up only on certain software.... maybe I should switch from IE to firefox.

jfetter

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #6 on: March 20, 2007, 03:01:47 PM »
Seems like you have to be logged in to see them. The circuit sounda sweet, now doing a front panel with "Front Panel Designer". I did put one soft diode to pre clip prior to supply running out, so no PS ripple present even at high levels.

I've ordered a Weber 6X9 8ohm to experiment with a 'local' speaker in the head. The test speaker to date has been a Red Fang.

The idea is a compact head that can be used for recording or practice. It will look like a head but is really a combo.

Then add a reverb in next design.
Bruce

jfetter

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #7 on: April 12, 2007, 11:19:39 PM »
Here is the new panel and chassis mock-up.

I picked too large router bit for small text engraving. Also forgot to pick grained finish. It still looks OK. The panel light is a radiio shack neon indicator lens and holder. I removed the neon assy and replaced with a 5,000 mcd 10mm red led. Its just a prototype so I'm trying out new.

Double drilling the panel/chassis is unnecessary by using the open end of the Bud CU-622A.

« Last Edit: April 14, 2007, 10:47:33 AM by jfetter »

jrc4558

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #8 on: April 16, 2007, 02:10:22 AM »
Great work and cool chassis! Where did you get them?
Also, which program opens the format of the layout you posted earlier?
Looking waaaay cool!

jfetter

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #9 on: April 16, 2007, 07:51:58 PM »
Its a .lib file that is used by Orcad Layout (pcb layout program). If you don't have access to Orcad try eagle
http://www.cadsoftusa.com/freeware.htm

I have not checked but it may actually have the pentawatt pkg in library. The free version is ok for two sided small boards, exactly what ss preamps and poweramps use.

Then send the gerber cad files to http://pcbfabexpress.com/ online.  They are the cheapest fastest no hassle.

The front panel is a free cad program from http://www.frontpanelexpress.com/ , very easy to use and attached is my example. No setup charges and you can buy one , two or production quantities.

unzip the nash20a.zip and open the .fpd file with frontpanelexpress program.

jfetter

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #10 on: April 29, 2007, 09:11:09 PM »
Finally got the head put together. I changed my mind on the clipping diode, took it out. The 6db filter on power amp output serves that purpose just fine and isolates the FB loop from load. So it becomes a partial current source open loop.

Also pictures of my lab bench. Probably looks like everyone elses. Working on the cab/head setup now. BTY the tone ckt is an active muff. The effect pedal is for input ckt saturation testing.

jfetter

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Re: final assy
« Reply #11 on: May 13, 2007, 08:50:43 PM »
Here is the final assy, switched to the 'Governor' for grins. The LED gives a brite starr appearance. I used a Geezer cab and mounted as shown with the right angle brackets. The chassis is mounted 0.25" from top of cab to allow air movement. The preamp board(is super quit) has a copper sheet shield but otherwise the chassis is open.

The soud is Fetzer like with very nice asymetrical clipping. Output filter is  -6db at 4000hz and does not allow hard clipping. the tone can scream.

joecool85

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #12 on: May 14, 2007, 07:22:52 AM »
You are doing some really great work here!  How does it sound?  And also, you might want to consider adding the schematic(s) to the schematics section here at the forum, I know I would appreciate it.
Life is what you make it.
Still rockin' the Dean Markley K-20X
"New" amp: Fender Frontman 25 DSP (FM25DSP)
thatraymond.com

jfetter

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #13 on: May 26, 2007, 03:08:16 PM »
Two short examples...
Amp is on max volume , center tone and center gain.

1st is on a strat using front pickup.
2nd is on Les Paul with bridge pickup.

The cab has a bad resonance at C# , you can hear it on the low registers( some people like that though) . Have to do some cab work and possibly reduce gain. Mic at aprox 6" in front with a stien e609.

www.avantpower.com/nash20/nash20-320.mp3

joecool85

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Re: Pentawatt layout TDA2030A and TDA2050 etc
« Reply #14 on: May 26, 2007, 05:49:14 PM »
WOW, that sounds great!  Good guitar skills as well.  Is this schematic posted in the schematics section?  If not, it should be.  I would consider posting it in the wiki as well.  If you don't know how, just ask and I'll help you out.
Life is what you make it.
Still rockin' the Dean Markley K-20X
"New" amp: Fender Frontman 25 DSP (FM25DSP)
thatraymond.com

 

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