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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: kids these days
Date: Mon, 30 Sep 2024 21:19:36 -0400
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"john larkin" <jl@glen--canyon.com> wrote in message news:hugmfj91o9i4p37suanbr9p49o12p131vs@4ax.com...
> On Mon, 30 Sep 2024 18:29:31 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"KevinJ93" <kevin_es@whitedigs.com> wrote in message news:vdev5a$2c45n$1@dont-email.me...
>>> On 9/30/24 10:21 AM, Edward Rawde wrote:
>>>> "john larkin" <JL@gct.com> wrote in message news:7bglfjtll1os4g6pfqhf1i7jl0acmrvlqv@4ax.com...
>>>>> On Mon, 30 Sep 2024 11:13:56 +0100, Cursitor Doom <cd@notformail.com>
>>>>> wrote:
>>>>>
>>>>>> On Mon, 30 Sep 2024 05:15:02 GMT, Jan Panteltje <alien@comet.invalid>
>>>>>> wrote:
>>>>>>
>>>>>>> On a sunny day (Sun, 29 Sep 2024 10:36:26 -0700) it happened john larkin
>>>>>>> <JL@gct.com> wrote in <kb3jfjpejs47hqjd00fis20eog8de19ae8@4ax.com>:
>>>>>>>
>>>>>>>> I wouldn't hire someone who complicates a simple question into
>>>>>>>> paralysis.
>>>>>>>>
>>>>>>>>
>>>>>>>> I draw a 10 volt battery connected to two resistors, 9K in series with 1K.
>>>>>>>
>>>>>>> The problem there is 'draw', no reality.
>>>>>>> The battery will have an internal resistance, maybe discharged too.
>>>>>>>
>>>>>>>> What's the voltage across the 1K?
>>...
>>>
>>> Looks like an audio pre-amp with RIAA equalization for a moving coil pickup.
>>>
>>
>>https://worldradiohistory.com/UK/Wireless-World/70s/Wireless-World-1974-12-S-OCR.pdf
>>Page 503 (pdf page 37)
>>
>>One thing I just noticed is that 2N4302 is n channel but shown as p channel.
>>
>>Anyone know of a part I can still buy which is sufficiently equivalent?
>>
>
> You could bootstrap a collector resistor and get about the same
> effect.
>
> The Supertex depletion fets make nice constant-current loads too. They
> are very repeatible, unlike jfets.
>
> What's the expected current in the jfet?
>

The current in the FET is about 50 uA in this version which has been adusted for 12V rather than 24V power.

Looks like J113 is a reasonable replacement in this circuit, and it is available.

Version 4
SHEET 1 1144 1280
WIRE -272 -144 -400 -144
WIRE 112 -144 -272 -144
WIRE 352 -144 112 -144
WIRE 544 -144 352 -144
WIRE -272 -96 -272 -144
WIRE 112 -96 112 -144
WIRE 352 -96 352 -144
WIRE 544 -16 544 -144
WIRE -272 16 -272 -32
WIRE 112 16 112 -16
WIRE 192 16 112 16
WIRE 352 32 352 -16
WIRE 480 32 352 32
WIRE 112 64 112 16
WIRE 192 112 192 80
WIRE 64 128 16 128
WIRE 112 176 112 160
WIRE 176 176 112 176
WIRE 112 192 112 176
WIRE 272 208 240 208
WIRE 544 208 544 80
WIRE 544 208 336 208
WIRE -400 256 -400 -144
WIRE 352 272 352 32
WIRE 16 304 16 128
WIRE 112 304 112 272
WIRE 112 304 16 304
WIRE 112 320 112 304
WIRE 240 320 240 208
WIRE 240 320 112 320
WIRE 288 320 240 320
WIRE 112 352 112 320
WIRE -288 400 -576 400
WIRE -240 400 -288 400
WIRE -224 400 -240 400
WIRE -128 400 -160 400
WIRE -16 400 -48 400
WIRE 48 400 -16 400
WIRE 352 400 352 368
WIRE 432 400 352 400
WIRE 352 416 352 400
WIRE 544 480 544 208
WIRE 592 480 544 480
WIRE 688 480 656 480
WIRE 832 480 768 480
WIRE 880 480 832 480
WIRE -16 496 -16 400
WIRE 16 496 -16 496
WIRE 112 496 112 448
WIRE 112 496 80 496
WIRE 112 512 112 496
WIRE 224 512 112 512
WIRE -240 528 -240 400
WIRE -16 528 -16 496
WIRE 352 528 352 496
WIRE 432 528 352 528
WIRE 112 544 112 512
WIRE 352 544 352 528
WIRE -576 608 -576 400
WIRE 832 608 832 480
WIRE -16 656 -16 608
WIRE 352 656 352 624
WIRE 352 656 -16 656
WIRE 544 672 544 480
WIRE 688 672 544 672
WIRE 112 688 112 624
WIRE 112 688 -16 688
WIRE -16 720 -16 688
WIRE 112 720 112 688
WIRE 352 720 352 656
WIRE 432 720 432 528
WIRE 544 720 544 672
WIRE 688 720 688 672
WIRE -576 832 -576 688
WIRE -400 832 -400 336
WIRE -400 832 -576 832
WIRE -240 832 -240 608
WIRE -240 832 -400 832
WIRE -16 832 -16 784
WIRE -16 832 -240 832
WIRE 112 832 112 800
WIRE 112 832 -16 832
WIRE 352 832 352 800
WIRE 352 832 112 832
WIRE 432 832 432 784
WIRE 432 832 352 832
WIRE 544 832 544 800
WIRE 544 832 432 832
WIRE 832 832 832 688
WIRE 832 832 544 832
WIRE -576 880 -576 832
WIRE 224 896 224 512
WIRE 256 896 224 896
WIRE 496 896 336 896
WIRE 544 896 496 896
WIRE 688 896 688 784
WIRE 688 896 624 896
WIRE 224 1024 224 896
WIRE 256 1024 224 1024
WIRE 368 1024 336 1024
WIRE 400 1024 368 1024
WIRE 496 1024 496 896
WIRE 496 1024 464 1024
WIRE 224 1136 224 1024
WIRE 256 1136 224 1136
WIRE 368 1136 368 1024
WIRE 368 1136 320 1136
FLAG -576 880 0
FLAG 192 112 0
FLAG -288 400 input
FLAG -272 16 0
FLAG 832 480 output
DATAFLAG 496 208 "round(($)*100)/100"
DATAFLAG 400 528 "round(($)*100)/100"
DATAFLAG 304 656 "round(($)*100)/100"
DATAFLAG 16 400 "round(($)*100)/100"
DATAFLAG 160 512 "round(($)*100)/100"
DATAFLAG 64 688 "round(($)*100)/100"
DATAFLAG 160 16 "round(($)*100)/100"
DATAFLAG 176 320 "round(($)*100)/100"
DATAFLAG 400 400 "round(($)*100)/100"
DATAFLAG 400 32 "round(($)*100)/100"
DATAFLAG 160 176 "round(($)*100)/100"
DATAFLAG -352 -144 "round(($)*100)/100"
SYMBOL res 96 -112 R0
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