Hotone Nano Legacy Amps - Heart Attack  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

Re: Hotone Nano Legacy Amps - Heart Attack

Postby phatt » 25 Dec 2017, 04:44

Specs state 6 Watts max into 8 Ohm load.
These are car amp chips and are designed to work into low Ohms and the output drops quite a lot into 8 Ohms
Also if you are using hifi type woofers or similar then the output SPL will be reduced even more. You need to use an MI speaker.

Another thing to note; You mentioned you have several preamp stages and the output might be too hot for such a small power stage.
As mentioned by *Fiveseven* above,, you need head room if you want clean and that means larger supply voltage and if that is not enough then a higher output power amp section.

It is my observation from experience that LM1875 chip or similar is just the ideal size for small bedroom amps the really small stuff just does not have the head room for clean.
At a guess the LM1875 should get close to 10Watts into 8 Ohms even from a single 20 Volt supply.
Phil.

For this message the author phatt has received thanks:
J0K3RX (25 Dec 2017, 18:23)
phatt
Diode Debunker
 
Posts: 971
Joined: 04 Aug 2010, 06:17
Location: Morayfield SE Qld AU
Has thanked: 0 time
Have thanks: 235 times

Re: Hotone Nano Legacy Amps - Heart Attack

Postby Ichabod_Crane » 25 Dec 2017, 14:58

Definetly I need more headroom, indeed I want absolute to find the right PSU how I described before.

I want to be more clear to help the topic. My experimental project, and I am not an expert, will have two separate preamps (clear and high gain), maybe one buffer in front of them, and one booster with the high gain preamp.
I never considereted the number of circuits in front of the power amp. I tested with happy results all the stages in front my main guitar amp. Now I'm testing the power amp stand alone with my cab.
My cabinet is a simple homemade cabinet, a wood box with a cheap 8" guitar amp 8 Ohm.

I'll remember the LM1875 for a louder amp project. Now, the TDA2003 should be fine. At least I would.
User avatar
Ichabod_Crane
Breadboard Brother
 
Posts: 78
Joined: 26 Apr 2016, 16:11
Has thanked: 7 times
Have thanks: 4 times

Re: Hotone Nano Legacy Amps - Heart Attack

Postby peterc » 27 Dec 2017, 18:49

Subscribed
peterc
 
Posts: 20
Joined: 30 Mar 2010, 19:58
Location: Jozi
Has thanked: 27 times
Have thanks: 0 time

Re: Hotone Nano Legacy Amps - Heart Attack

Postby J0K3RX » 22 Feb 2018, 18:54


For this message the author J0K3RX has received thanks:
Ice-9 (22 Feb 2018, 19:07)
User avatar
J0K3RX
Degoop Doctor
 
Posts: 990
Joined: 29 Jun 2011, 02:25
Location: US Florida
Has thanked: 309 times
Have thanks: 471 times

Re: Hotone Nano Legacy Amps - Heart Attack

Postby Ice-9 » 22 Feb 2018, 19:10

Now, If I could buy bare enclosures like this I would be very happy. :wink:
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
User avatar
Ice-9
Transistor Tuner
 
Posts: 1037
Joined: 31 Mar 2009, 16:29
Has thanked: 137 times
Have thanks: 350 times

Re: Hotone Nano Legacy Amps - Heart Attack

Postby jalmonsalmon » 23 Feb 2018, 17:13

J0K3RX wrote:Look what I stumbled upon...

[ Image ]

http://www.hotoneaudio.com/products/Nan ... 5/256.html


Britwind as well

Wonder how much those are gonna be? :applause:
User avatar
jalmonsalmon
Solder Soldier
 
Posts: 192
Joined: 14 Sep 2012, 23:49
Has thanked: 66 times
Have thanks: 23 times

Previous

Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: ricmc, zamguitar and 18 guests