Hello everyone, I built this operational transistor and let me know which circuit and 'suitable to build a line-stage preamplifier.
must be supplied with dual voltage and the more 'simple as possible.
I tried to replace it with a NE5532 and I can say that it works very well but I would like a circuit that uses all its potential
it's use bc550c /bc560c and bd135-bd136
tks
must be supplied with dual voltage and the more 'simple as possible.
I tried to replace it with a NE5532 and I can say that it works very well but I would like a circuit that uses all its potential
it's use bc550c /bc560c and bd135-bd136
tks
This topology gives excellent results (it's similar to the Jensen JE990, but complimetary) - a few improvements are possible:
1) A current mirror on the LTP helps increase loop gain as well as equalize input offsets at the LTP.
2) Instead of a Darlington VAS, and emitter-follower driving a common-emitter VAS gives better results with the same number of transistors.
3) The Miller compensation may be referenced to the output (Cherry compensation), rather than the collector of the VAS, and helps reduce distortion of the output stage also.
1) A current mirror on the LTP helps increase loop gain as well as equalize input offsets at the LTP.
2) Instead of a Darlington VAS, and emitter-follower driving a common-emitter VAS gives better results with the same number of transistors.
3) The Miller compensation may be referenced to the output (Cherry compensation), rather than the collector of the VAS, and helps reduce distortion of the output stage also.
opamp jensen
Can you explain with a diagram maybe intervening on my drawing?
the schematic it's a clone of jensen 918
Can you explain with a diagram maybe intervening on my drawing?
the schematic it's a clone of jensen 918
new clone
this is my new clone with lower dimension pcb
Hello everyone, I built this operational transistor and let me know which circuit and 'suitable to build a line-stage preamplifier.
must be supplied with dual voltage and the more 'simple as possible.
I tried to replace it with a NE5532 and I can say that it works very well but I would like a circuit that uses all its potential
it's use bc550c /bc560c and bd135-bd136
tks
this is my new clone with lower dimension pcb
now i can same more space with a new pcb design.
so i have a 27x30mm max. ,, very good for replace some ic-standard operational amplifier.
psu max voltage
it work fine with max +20/-20 v .
the best voltage is +15/-15 v
i have a stock kit of 4pz at 20eu, incluse ship.
it work fine with max +20/-20 v .
the best voltage is +15/-15 v
i have a stock kit of 4pz at 20eu, incluse ship.
2018 discrete op
this is the new 2018 model of discrete op Jensen clone!
the pcb is now much smaller than the previous version, the arrangement of the components has also been improved.
the new dimensions of the op now allow its assembly inside devices with limited spaces.
the new base for mechanical and electrical support is under construction and are of two types with which it is possible to replace operational units such as ne5532 or ne5532 or similar.
this is the new 2018 model of discrete op Jensen clone!
the pcb is now much smaller than the previous version, the arrangement of the components has also been improved.
the new dimensions of the op now allow its assembly inside devices with limited spaces.
the new base for mechanical and electrical support is under construction and are of two types with which it is possible to replace operational units such as ne5532 or ne5532 or similar.
Attachments
a test on output stage ...only the PCBs are available now, two pcb with the support base cost 6eu, shipping to USA costs 5.50eu.
in the picture I used the resistances I had available, greetings
Attachments
Attachments
this model substitute the classic op like 5534 , tl071 and other with a single
circuit inside .
ready to install.
it's sold fot 16eu.
ship 4,90eu
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.