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August 12, 2022, 07:46:21 AM

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Recent posts

#21
Amplifier Discussion / Re: Adafruit PAM8302 Amplifer
Last post by Carriage - July 20, 2022, 06:50:39 AM
So I added the tonemender tonestack to the breadboard and with the gain down in the first stage it sounds like advertised.

With the gain up I still wasn't so happy with it. At very specific gains it sounded okay but past that it sounded kind of like the clean with a fuzz/noise behind it. I don't know if the analysis is leading me to think that but it's not particularly pleasing.

I put the clipping diodes after the tonestack to not much difference. I then removed the ones in the first stage and it's  heaps better to my ear.

There's still a few things I want to fiddle with plus I realised the op amps I've bought aren't designed for single sided supply, though they're working. I'll try and get some sound samples too when I get some time
 
#22
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - July 20, 2022, 04:57:05 AM
Checked the ac on speaker 3.59vac
It drops to 1.32 wiith a jumper from cr3 anode to ground.
#23
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - July 20, 2022, 04:36:02 AM
I also checked for broken pads/cracked solder and all checked out ok.

Thanks,
Andy
#24
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - July 20, 2022, 04:30:00 AM
Hi all,

I finally got hold of the new filter caps and had time to install them. I also replaced q9 while the board was out.

Long story short - I still have the same or similar buzz happening.

After cap replacement I checked for dc on speaker 0.023vdc

Tp1 30.05vac
Tp2 30.00vac
Tp3 39.02vdc
Tp4 -39.03vdc

Ac voltages

Tp3 0.066vac
Tp4 0.209vac


#25
Amplifier Discussion / Re: Adafruit PAM8302 Amplifer
Last post by Carriage - July 19, 2022, 10:49:31 PM
It wasn't amazing. It's just the first stage into the flat channel on my THR. I'm thinking I perhaps instead play with the tonestack first to get a pleasing enough clean tone and then add the gainy tone on top.

This all assumes the THR's flat channel is going to be similar to the PAM8302. That's still in the post and I need to get my speaker cab back from a friend too.
#26
Amplifier Discussion / Re: Adafruit PAM8302 Amplifer
Last post by joecool85 - July 19, 2022, 11:24:41 AM
Quote from: Carriage on July 18, 2022, 05:38:17 AMParts have arrived from tayda.
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How's it sound?
#27
Amplifier Discussion / Re: Sunn concert lead and amp ...
Last post by Enzo - July 18, 2022, 08:34:13 PM
Look on sites like ebay or Reverb.com and see what they are selling for.
#28
Amplifier Discussion / Sunn concert lead and amp inqu...
Last post by Sheldonvalleau - July 18, 2022, 03:02:41 PM
Hello gear lovers,

I have a huge Sunn amp with concert lead, wondering if anybody would be able to tell me what it's worth, it's in pretty good shape. I don't want it going to the wrong person. I can send pics and more deets through email etc.

Thanks
#29
Amplifier Discussion / Re: Adafruit PAM8302 Amplifer
Last post by Carriage - July 18, 2022, 05:38:17 AM
Parts have arrived from tayda.
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#30
Amplifier Discussion / Re: Adafruit PAM8302 Amplifer
Last post by Loudthud - July 18, 2022, 04:04:16 AM
This effect is not what I would call "Diode hash". It's not any fault with the diodes. The circuit is doing exactly what the math says it will do. To get rid of the "1+" effect, use the inverting form of feedback. See attached. The one disadvantage is the low input impedance, so you really need an input buffer like the TS pedal.
You cannot view this attachment.