Please find some pics of my new amplifier, this works a dream with no issues at all. To my ears sounds very good. What do you think, the tiger eyes light up blue and indicate the PSU is healthy. There are quite a few threads on this site indicating issues with this design, well this one works 100%
regards Nick
regards Nick
Attachments
the case is a maplin 2u case, I had the feet made by a local engineering company. Then I made a ali chassis plate to go on the bottom of the case to mount all the electronics onto. This is something I was playing around with, jamesfeline (thats me) so the tiger I thought was a good label for my work. On my next design the tiger eyes will change colour when the amplifier gets hot.
regards
Nick
regards
Nick
Cool... i did wonder about the case, the Maplin one has a perforated base usually...
Did you do the front plate yourself or did you have that made? If you had it made, who did it and how much ? 🙂
Did you do the front plate yourself or did you have that made? If you had it made, who did it and how much ? 🙂
k4005
Thanks everyone for the kind comments, I am making a JLH class A headphone amplifier at the moment, I will share with you photos when this has been completed.
all the best Nick
Thanks everyone for the kind comments, I am making a JLH class A headphone amplifier at the moment, I will share with you photos when this has been completed.
all the best Nick
Just for info
these amps are still going strong and providing many happy listening hours, under rated amplifier in my opinion
these amps are still going strong and providing many happy listening hours, under rated amplifier in my opinion
I recently came across this amp when I was looking trough some stuff.
So I looked on the forum and came across this post.
I have build this amp when I was around 13years of age to replace my smaller amp I got second hand for free and was limited (sounded great but "only" 30w rms) for DJ use 🙂
I had build 2 modules with seperate power supplies and put it in one casing. with some big 120mm fans blowing over the heatsinks.
I used it a lot at school parties etc... and having 200w of real power it surprised many people and it never let me down.
Also the sound is really nice. The bass sounds great as do the highs.
And that only from some tip147/142 darlingtons.... it has amazed me many times.
So now I have 2 fane 12" fullranges in compact monitor/allround cabs and I want to make them active.
The amps sit unused for some time now so I was thinking of using them.
200w on those fane 12" full range speakers will work nice.
Only thing I was thinking of.
Wouldn't it be better to use some more decent output transistors? something like the MJ11015/MJ11016 pair.
The voltage could also be a little bit higher without risk of damage. (+/-42v)
This will give a little bit more peak output. (estimated around 130-150w @4ohm or 260-300w in bridged mode).
I need another heatsink but the intention is to make a plate amp with some balanced inputs and the heatsink used is not that ideal for this...
Active peaking filter will also be used like this Project 197
Long story... if anyone has an opinion about using other output transistors with this design please comment 🙂
So I looked on the forum and came across this post.
I have build this amp when I was around 13years of age to replace my smaller amp I got second hand for free and was limited (sounded great but "only" 30w rms) for DJ use 🙂
I had build 2 modules with seperate power supplies and put it in one casing. with some big 120mm fans blowing over the heatsinks.
I used it a lot at school parties etc... and having 200w of real power it surprised many people and it never let me down.
Also the sound is really nice. The bass sounds great as do the highs.
And that only from some tip147/142 darlingtons.... it has amazed me many times.
So now I have 2 fane 12" fullranges in compact monitor/allround cabs and I want to make them active.
The amps sit unused for some time now so I was thinking of using them.
200w on those fane 12" full range speakers will work nice.
Only thing I was thinking of.
Wouldn't it be better to use some more decent output transistors? something like the MJ11015/MJ11016 pair.
The voltage could also be a little bit higher without risk of damage. (+/-42v)
This will give a little bit more peak output. (estimated around 130-150w @4ohm or 260-300w in bridged mode).
I need another heatsink but the intention is to make a plate amp with some balanced inputs and the heatsink used is not that ideal for this...
Active peaking filter will also be used like this Project 197
Long story... if anyone has an opinion about using other output transistors with this design please comment 🙂
Hello .. yes the amps are still going strong never let me down
I have 2 mono blocks in bridge configuration - plus now have spare PCB's
I have 2 mono blocks in bridge configuration - plus now have spare PCB's
Little update I have now made my own Gerbers for this amplifier
It sounds nice plus I had loads of TDA7250 driver chips to use .. plus I have had 2 mono blocks running and abused for over 20 years odd and still working well
It sounds nice plus I had loads of TDA7250 driver chips to use .. plus I have had 2 mono blocks running and abused for over 20 years odd and still working well
I have attached the manual which is freely available on the net (plus the kit has been out of production for years) plus when I approached the manufacture they was not interested at all ..
hopefully not breaking any rules etc 🙂
my new Gerbers / PCB use gold tracks 2.0 oz made in the uk with some small enhancements plus Farley cheap to make if you are on a budget plus it sounds really nice
hopefully not breaking any rules etc 🙂
my new Gerbers / PCB use gold tracks 2.0 oz made in the uk with some small enhancements plus Farley cheap to make if you are on a budget plus it sounds really nice
Strange I see this only today... Same here, 2 mono blocks in bridge each - still going perfect after > 20 years.