Does your mains have 3 wires or 2? If 3 how do you connect your earth?
You may want to add some caps at least to those rails.
If you build the minimalist amp, and went from lower voltage where it worked to higher supply without adjusting that biasing resistor, you may have biased the chip by more than it could handle...
You still did not say if you used 4 or 8 ohms.
for 4 ohms then max you can use is about 28V.
You may want to add some caps at least to those rails.
If you build the minimalist amp, and went from lower voltage where it worked to higher supply without adjusting that biasing resistor, you may have biased the chip by more than it could handle...
You still did not say if you used 4 or 8 ohms.
for 4 ohms then max you can use is about 28V.
Grandma´s_SUB said:
Grandma´s_SUB,
The schematics look right to me. You used zener diode symbols but I assume you used normal diodes in your bridge. I've made GCs nearly identical to this schematic so I know it should work.
You need to double check you wiring and earthing. I think you need to post a couple of pictures.
I think you're doomed, dude...start over
This time with a proven design like Nuuk's or hell...even my junior effort. Gosh...I hope the Iranians are not approaching nuclear power the same way you did with your first amp
The chip's only six bucks from Digikey...heck...I'll mail you one if you promise to wire it up right this time
This time with a proven design like Nuuk's or hell...even my junior effort. Gosh...I hope the Iranians are not approaching nuclear power the same way you did with your first amp
The chip's only six bucks from Digikey...heck...I'll mail you one if you promise to wire it up right this time
http://www.diyaudio.com/forums/showthread.php?postid=1053952#post1053952
Is this the first attempt ?
Is this the first attempt ?
ash_dac said:
Its other 20 reasons, why it wouldnt work.
The problem is that everyone writes his own story, that i just got cunfused and know less that at the begining.
pinkmouse said:
Hell no. Physical apperance looks ok, but u havent said if it is ok, cus Ive measured resistances between power supply legs
You need to go back to Mistake # 1 which is that you grabbed a dubious unproven schematic to build a first amp. If you wanna fix the design, that's fine but then you need to do a lotta reading or combing through ancient threads here.
Here's my little amp schematic. You may need to tweak the resistor values to tone down the gain depending on your input level along with the C1 cap value but I know that at least this seemed to work for me for a mono amp.
Here's my little amp schematic. You may need to tweak the resistor values to tone down the gain depending on your input level along with the C1 cap value but I know that at least this seemed to work for me for a mono amp.
Attachments
Stick some big capacity 8 ohm resistor instead of a speaker at the output and check for DC voltage...you know...the big 50W or higher resistors encapsulated in an aluminum heatsink from the factory. This might be cheaper than continuing to smoke nice speakers
Or buy yourself an Adcom amp and pick a different hobby...
Or buy yourself an Adcom amp and pick a different hobby...
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.