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Old 8th December 2010, 07:34 AM   #641
osscar is online now osscar  Latvia
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Hi,

Here's my monster PCB finished yesterday- thanks for nice layout to PCB designer from this thread! ( without all transistors, corresponding resistors and the pot, because I do not know what will be the transistors BL or GR type or alternative Jfets and outputs also installed just for PCB fitting test- still waiting for original transistors instead of TIPs ).
PSU planned to be + - 12V Pass-style CRC filter with approximately 40000uf 0.1R and another 40 000uf per rail. transformer will be 200VA with fast diodes and i plan to add soft start - thermistor or relay with power resistors. Still need to solder Fuse holders on PSU board and add some snubber capacitor across diodes.

Click the image to open in full size.

Click the image to open in full size.
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Old 10th December 2010, 08:03 AM   #642
osscar is online now osscar  Latvia
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hello,
Today I got the ISC 844 and 754 output transistors. Visually it looks good. But how is their quality? Does anyone have them use your monster or Is it better to stick to the TIP pairs?

thank you!


regards,

Oskars
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Old 10th December 2010, 08:30 AM   #643
neazoi is offline neazoi  Greece
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Quote:
Originally Posted by osscar View Post
Hi,

Here's my monster PCB finished yesterday- thanks for nice layout to PCB designer from this thread! ( without all transistors, corresponding resistors and the pot, because I do not know what will be the transistors BL or GR type or alternative Jfets and outputs also installed just for PCB fitting test- still waiting for original transistors instead of TIPs ).
PSU planned to be + - 12V Pass-style CRC filter with approximately 40000uf 0.1R and another 40 000uf per rail. transformer will be 200VA with fast diodes and i plan to add soft start - thermistor or relay with power resistors. Still need to solder Fuse holders on PSU board and add some snubber capacitor across diodes.

Click the image to open in full size.

Click the image to open in full size.
It seems another monster is being born!
a note here, you use wire resistors for the power transistors which have much inductance. Look at my version here Le monstre which uses metal resistors. I have many of them matched and available if you are interested you may contact me at skylimit000 AT gmail.com


Yesterday I reversed the input fets and started to convert the PSU coaxial plugs that I used (BNC not banana ones) in order the supply lines to use the external conductors which are thicker. Note I have not put these two conversions on the website yet.
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Old 10th December 2010, 12:13 PM   #644
osscar is online now osscar  Latvia
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Currently I more worried about the choice of output transistors. JFET will be used 170/74 GR.
Thanks for the resistors offer - i will think about it.
here photo of transistors and the new enclosure .


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

If I understand correctly, these transistors are not fakes, but a copy of original but i have doubts about quality .
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Old 10th December 2010, 12:16 PM   #645
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Does the capacitors (47uF) on the amplifier PCB make any difference if placed with greater capacitance?
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Old 10th December 2010, 01:14 PM   #646
neazoi is offline neazoi  Greece
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Quote:
Originally Posted by Simeon Kostadinov View Post
Does the capacitors (47uF) on the amplifier PCB make any difference if placed with greater capacitance?
Yes, There is a discussion about this in an earlier post. I have put a total of 4700uF in parallel with 0.47uF teflon cap in mine. The PSU has huge of capacitance anyway so I do not know if the value on the PCB matters. I have the battery only PSU that is why I have put greated capacitance here.
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Old 10th December 2010, 01:17 PM   #647
neazoi is offline neazoi  Greece
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Originally Posted by osscar View Post
Currently I more worried about the choice of output transistors. JFET will be used 170/74 GR.
Thanks for the resistors offer - i will think about it.
here photo of transistors and the new enclosure .


If I understand correctly, these transistors are not fakes, but a copy of original but i have doubts about quality .
Where did you get this box?
I had a hard time making the homemade box!
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Old 10th December 2010, 02:31 PM   #648
osscar is online now osscar  Latvia
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Hi, box from modu, maybe its too big for monstre, but i like it .

I know how difficult and time consuming to produce the box with own hands and and if you do not have a complete set of tools...
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Old 10th December 2010, 04:17 PM   #649
Elias is offline Elias  Finland
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Hi,

Those boxes look ok, but I didn't find any company information from that page? Address, nothing..


- Elias


Quote:
Originally Posted by osscar View Post
Hi, box from modu,
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Old 10th December 2010, 06:18 PM   #650
osscar is online now osscar  Latvia
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modu

Look here !

Just checked PSU voltage- 16V without load, seems a bit too high.
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