Look like the Matti Otala circuit to me.. a bit cramped! I guess this was for posting on some packet radio system?
Re:Hi FI P12W4R
Even the good news is not good without a description of its purpose. Anyone who examines method the dynamic linearity of the transistors, also knows. This is possible only low power and a clean amp.
Even the good news is not good without a description of its purpose. Anyone who examines method the dynamic linearity of the transistors, also knows. This is possible only low power and a clean amp.
Even the good news is not good without a description of its purpose. Anyone who examines the methods of the dynamic linearity of transistors, knows this well, this is possible only for low power and for a clean amp. All my audio amplifier electronic schematics are pure and classical technique. Pure amplifier is no worse than the symmetrical.
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Re:Hi FI P12W4R
BD355/354 power transistors(Rcd=13R) are not good for pure audio amplifier, but what is good.
BD355/354 power transistors(Rcd=13R) are not good for pure audio amplifier, but what is good.
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Re:Hi FI P12W4R
Clean Audio transistors operate dynamically on the resistance of the collector Rcd = 150R - 240R - 685R - 1.5 --- 1.8k, have a greater range of linearity current -for the collector resistance. In addition, the serial bases resistance is basis for a stable and linear operation of the transistor.
Clean Audio transistors operate dynamically on the resistance of the collector Rcd = 150R - 240R - 685R - 1.5 --- 1.8k, have a greater range of linearity current -for the collector resistance. In addition, the serial bases resistance is basis for a stable and linear operation of the transistor.
BD203-204 ...may still manufactured by Unitra ...a world famous company ( in poland ) and also seem to be available from cdil which as far as i know ( please someone correct me here ) is an India low quality manufacturer ( ft of 7 mhz )
since this type of semis is unavailable for most of us is there a chance that you design something that is made with semis that is used by most people or most manufacturers ?
neither Unitra Nor cdil is a trusted manufacturer and you demands in specs are very precise ...
still you failed to answer my questions regarding changes in voltage and b of transistors ... of course you dont have to ... but in any case i will be waiting ....
As about your supplier of transistors is no longer in business in case you didnt know that ...
Quotet from internet :
Unitra Cemi Profile
Current Inventory Technical Documentation
Unitra Cemi Company Overview
Unitra Cemi was a Warsaw-based Polish microelectronics company developed in the 1970s. Unitra Cemi manufactured transistors, clone CPUs and microcontrollers. The company is no longer in business.
Products Manufactured by Unitra Cemi
The types of products manufactured by Unitra Cemi include Transistors, CPUs and microcontrollers.
Obsolete Unitra Cemi Products
Obsolete, legacy and hard-to-find products from Unitra Cemi are also still widely available from Procure International, Inc., either shipping directly from stock or sourced from excess inventory through our qualified network of OEMs. To submit an enquiry, you can either browse through some of the Unitra Cemi products we have available below or use the Part Search function above to search for the exact part number you require.
Shortages
If you have a current shortage requirement for Unitra Cemi products or need products from Unitra Cemi that are now obsolete, chances are that we have it in stock or can find it for you. Simply use the Part Search function above, supply us with the quantity required and target price (if available), and one of our experienced Sales Representatives will respond with a formal quotation
since this type of semis is unavailable for most of us is there a chance that you design something that is made with semis that is used by most people or most manufacturers ?
neither Unitra Nor cdil is a trusted manufacturer and you demands in specs are very precise ...
still you failed to answer my questions regarding changes in voltage and b of transistors ... of course you dont have to ... but in any case i will be waiting ....
As about your supplier of transistors is no longer in business in case you didnt know that ...
Quotet from internet :
Unitra Cemi Profile
Current Inventory Technical Documentation
Unitra Cemi Company Overview
Unitra Cemi was a Warsaw-based Polish microelectronics company developed in the 1970s. Unitra Cemi manufactured transistors, clone CPUs and microcontrollers. The company is no longer in business.
Products Manufactured by Unitra Cemi
The types of products manufactured by Unitra Cemi include Transistors, CPUs and microcontrollers.
Obsolete Unitra Cemi Products
Obsolete, legacy and hard-to-find products from Unitra Cemi are also still widely available from Procure International, Inc., either shipping directly from stock or sourced from excess inventory through our qualified network of OEMs. To submit an enquiry, you can either browse through some of the Unitra Cemi products we have available below or use the Part Search function above to search for the exact part number you require.
Shortages
If you have a current shortage requirement for Unitra Cemi products or need products from Unitra Cemi that are now obsolete, chances are that we have it in stock or can find it for you. Simply use the Part Search function above, supply us with the quantity required and target price (if available), and one of our experienced Sales Representatives will respond with a formal quotation
Re:Hi FI P12W4R
French and Polish production of transistors were the same:
BC148/158, BC107/177, BC108/BC178, BC211/313,
BD354/355-BD254/255, ( BDY23--25).
This type transistors are fast.
French and Polish production of transistors were the same:
BC148/158, BC107/177, BC108/BC178, BC211/313,
BD354/355-BD254/255, ( BDY23--25).
This type transistors are fast.
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