J. Gerhard answer: http://www.diyaudio.com/forums/analogue-source/154210-mpp-140.html#post2202746 I will go to try balanced due to the fact the rest of mine system is balanced.
Salas
I measured my 100 pieces 2SK170V with 10VDC and 100R resistor.
Result:
9-10 mA 8 pcs.
10-11 mA 25 pcs.
11-12 mA 24 pcs.
12-13 mA 18 pcs.
13-14 mA 18 pcs.
14-15 mA 7 pcs.
So, I have no chance to build the 15mA Version of this circuit.
Which circuit version would you recommend to obtain 60dB gain?
I would prefer to go with 10 to 12mA, looking at the available numbers.
Franz
I measured my 100 pieces 2SK170V with 10VDC and 100R resistor.
Result:
9-10 mA 8 pcs.
10-11 mA 25 pcs.
11-12 mA 24 pcs.
12-13 mA 18 pcs.
13-14 mA 18 pcs.
14-15 mA 7 pcs.
So, I have no chance to build the 15mA Version of this circuit.
Which circuit version would you recommend to obtain 60dB gain?
I would prefer to go with 10 to 12mA, looking at the available numbers.
Franz
Hi Rcruz
Yes, about output cap no back to Auricap: Obbligatos perform extraordinarily well togheter the Vishay.
Mine idea for balanced is one big pcb with the 4 regs. togheter the 4 Simplistic NJFET Phono RIAA & in a separate box the Tx + PSU, first approach will be using only using the same 2 Tx & 2 PSU that I'm using now & after upgrade for 4 Tx + 4 PSU.
Its the way they interact with the rest. The target Lipshitz is the same. Resistor values change with different IDSS tunings and create a new total filter transfer function, so I compensate C3. For 100uF change, R9 is larger here for instance, so Q2 need not run more current to bias circa 10V, hence C5 is enough RC.
P.S. Due to tolerances of all components, C3 is advised to be trimmed by ear in each individual system by preference.
P.S. Due to tolerances of all components, C3 is advised to be trimmed by ear in each individual system by preference.
Mu-metal shield & LSK380BL
@Rcruz
Arrived the mumetal shield 196mm x 315mm back self adhesive:
I'm doubting for balanced use the 2SK170BL or the LSK389BL, I have both on hand only need the measure the Idss in the LSK389BL. If I will use 2SK170BL will be all new & I suppose that will better sharing the same pcb the regs & the phono & if I will use LSK389BL will be less work because half work done. 20pcs photo:
Humm I'm enjoying only to mind in the work & the final success.
@Rcruz
Arrived the mumetal shield 196mm x 315mm back self adhesive:
An externally hosted image should be here but it was not working when we last tested it.
I'm doubting for balanced use the 2SK170BL or the LSK389BL, I have both on hand only need the measure the Idss in the LSK389BL. If I will use 2SK170BL will be all new & I suppose that will better sharing the same pcb the regs & the phono & if I will use LSK389BL will be less work because half work done. 20pcs photo:
An externally hosted image should be here but it was not working when we last tested it.
Humm I'm enjoying only to mind in the work & the final success.
Salas
Many thanks for your 11mA IDDS / 60dB gain simulation. It is very helpful, as I dont have the simulation software and all the needed knowledge behind it.
I will follow this path now, as I have all the needed parts.
Franz
P.S.
Any recommendations for a readily available shunt regulated pcb?
Many thanks for your 11mA IDDS / 60dB gain simulation. It is very helpful, as I dont have the simulation software and all the needed knowledge behind it.
I will follow this path now, as I have all the needed parts.
Franz
P.S.
Any recommendations for a readily available shunt regulated pcb?
I started the layout of my pcb.
The complete stereo circuit:
The pcb draft (every feedback and critic is welcome)
And the raw material:
Do the FET's require heathsinking?
Franz
The complete stereo circuit:
An externally hosted image should be here but it was not working when we last tested it.
The pcb draft (every feedback and critic is welcome)
An externally hosted image should be here but it was not working when we last tested it.
And the raw material:
An externally hosted image should be here but it was not working when we last tested it.
Do the FET's require heathsinking?
Franz
R1, 101 must be 1.3K. Made by 3 pieces 3K9 1W in parallel in the 15mA IDSS first circuit you asked. Its a single 2K2 2W in the 11mA circuit. R12,C9a,b Would be more useful if not feeding the whole, but reserved for first stage so it cuts interaction, the other stages have already.
Attachments
No - the only 37V limit is the voltage difference between Vin and Vout.
So, as long as your Vin is not more than 37V higher than your Vout (and you respect the SOA) you can use LM317 at whatever absolute voltage value you wish (people often use it in tube circuits at 250V or 300V).
what about during start up? Particularly is there is a discharged capacitor on the output.
Is there any data for the 317 subjected to transient voltage overload?