Re: kids these days

"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.

It can't be denied that a bootstrap version has similar, maybe near enough identical performance and eliminates the FET completely.

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 32 112 -16
WIRE 208 32 112 32
WIRE 352 32 352 -16
WIRE 480 32 352 32
WIRE 208 80 208 32
WIRE 112 128 112 32
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 112 320 112 208
WIRE 240 320 240 208
WIRE 240 320 112 320
WIRE 288 320 240 320
WIRE 112 352 112 320
WIRE 352 384 352 368
WIRE 432 384 352 384
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 208 400 208 144
WIRE 352 400 352 384
WIRE 352 400 208 400
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 -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 32 "round(($)*100)/100"
DATAFLAG 160 320 "round(($)*100)/100"
DATAFLAG 400 384 "round(($)*100)/100"
DATAFLAG 400 32 "round(($)*100)/100"
DATAFLAG -352 -144 "round(($)*100)/100"
SYMBOL res 96 -112 R0
SYMATTR InstName R1
SYMATTR Value 47k
SYMBOL voltage -400 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 -151 71 Left 2
WINDOW 3 -79 36 Left 2
SYMATTR SpiceLine Rser=0.1
SYMATTR Value 12
SYMATTR InstName V1
SYMBOL npn 48 352 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL res 96 112 R0
SYMATTR InstName R2
SYMATTR Value 150k
SYMBOL npn 480 -16 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL res 336 -112 R0
SYMATTR InstName R3
SYMATTR Value 22k
SYMBOL npn 288 272 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL polcap 192 80 R0
SYMATTR InstName C2
SYMATTR Value 10�
SYMBOL res 96 528 R0
SYMATTR InstName R4
SYMATTR Value 470
SYMBOL res 96 704 R0
SYMATTR InstName R5
SYMATTR Value 39k
SYMBOL res -32 512 R0
WINDOW 0 -41 40 Left 2
WINDOW 3 -63 76 Left 2
SYMATTR InstName R6
SYMATTR Value 270k
SYMBOL cap 80 480 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 470p
SYMBOL polcap -32 720 R0
SYMATTR InstName C3
SYMATTR Value 22�
SYMBOL res -32 384 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL polcap -160 384 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C4
SYMATTR Value 1�
SYMBOL res -256 512 R0
WINDOW 0 40 38 Left 2
WINDOW 3 36 74 Left 2
SYMATTR InstName R8
SYMATTR Value 68k
SYMBOL res 528 704 R0
SYMATTR InstName R9
SYMATTR Value 3.3k
SYMBOL cap 336 192 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C5
SYMATTR Value 10p
SYMBOL res 336 528 R0
WINDOW 0 -52 35 Left 2
WINDOW 3 -58 72 Left 2
SYMATTR InstName R10
SYMATTR Value 5.6k
SYMBOL res 336 704 R0
WINDOW 0 -53 28 Left 2
WINDOW 3 -47 61 Left 2
SYMATTR InstName R11
SYMATTR Value 10k
SYMBOL res 336 400 R0
WINDOW 0 -59 36 Left 2
WINDOW 3 -61 76 Left 2
SYMATTR InstName R12
SYMATTR Value 2.2k
SYMBOL res 352 880 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value 680k
SYMBOL res 640 880 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R14
SYMATTR Value 1.5k
SYMBOL res 352 1008 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R15
SYMATTR Value 24k
SYMBOL cap 320 1120 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 3.3n
SYMBOL cap 464 1008 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C7
SYMATTR Value 10n
SYMBOL polcap 672 720 R0
SYMATTR InstName C8
SYMATTR Value 1�
SYMBOL polcap 416 720 R0
SYMATTR InstName C9
SYMATTR Value 100�
SYMBOL polcap -288 -96 R0
SYMATTR InstName C10
SYMATTR Value 220�
SYMBOL polcap 592 496 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName C11
SYMATTR Value 1�
SYMBOL res 784 464 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R16
SYMATTR Value 100
SYMBOL res 816 592 R0
SYMATTR InstName R17
SYMATTR Value 1000k
SYMBOL voltage -576 592 R0
WINDOW 3 -283 51 Left 2
WINDOW 123 -283 79 Left 2
WINDOW 39 -283 107 Left 2
SYMATTR Value SINE(0 0.1 1000)
SYMATTR Value2 AC 0.1 0
SYMATTR SpiceLine Rser=0
SYMATTR InstName V2
TEXT -864 808 Left 2 !.ac oct 20 5 3000000
TEXT -864 880 Left 2 ;.tran 100m

>
The Supertex depletion fets make nice constant-current loads too. They
are very repeatible, unlike jfets.
>
What's the expected current in the jfet?