Ok, thanks for the info. Regarding linear.com, I can't seem to figure
out what software to download ... there are many options yet none
clearly say "circuit simulator".
John Fields wrote:
On Fri, 17 Mar 2006 17:34:25 -0800, GuitarPsych
wrote:
Thank you!
It is the FZ-1A listed on this diagram.
---
OK, It looks like you can just go ahead and connect the battery and
adjust the 50k pot (shown as R6 on the attached simulation) to get
the output you need, but you might have to short out the 2.2k and
remove the 22k resistors shown on your schematic in order to keep
the second transistor from going into saturation.
I couldn't find a germanium PNP spice model, so I went ahead and
used silicon just to see what would happen, and it looks like if you
can get the base of the second transistor biased close enough to
ground, you can get it to work. The thing hardly draws any current,
so the 9V battery ought to last a while, but when it starts getting
weak you can get sone extra life out of it by adjusting the pot
again, as required...
If you want to fool around with it you can download the simulator
from:
http://www.linear.com/company/software.jsp
and here's the circuit file:
Version 4
SHEET 1 952 680
WIRE -544 304 -544 -32
WIRE -544 544 -544 384
WIRE -400 304 -400 224
WIRE -400 544 -544 544
WIRE -400 544 -400 384
WIRE -400 592 -400 544
WIRE -304 224 -400 224
WIRE -192 224 -224 224
WIRE -96 224 -128 224
WIRE -96 352 -96 224
WIRE -96 544 -400 544
WIRE -96 544 -96 432
WIRE -32 224 -96 224
WIRE 32 -32 -544 -32
WIRE 32 176 32 -32
WIRE 32 288 32 272
WIRE 32 352 32 288
WIRE 32 544 -96 544
WIRE 32 544 32 432
WIRE 112 288 32 288
WIRE 192 -32 32 -32
WIRE 192 32 192 -32
WIRE 192 288 176 288
WIRE 192 288 192 112
WIRE 224 288 192 288
WIRE 224 352 224 288
WIRE 224 544 32 544
WIRE 224 544 224 432
WIRE 272 288 224 288
WIRE 336 -32 192 -32
WIRE 336 32 336 -32
WIRE 336 208 336 112
WIRE 336 240 336 208
WIRE 336 544 224 544
WIRE 336 544 336 336
WIRE 384 208 336 208
WIRE 496 208 448 208
WIRE 496 352 496 208
WIRE 496 544 336 544
WIRE 496 544 496 432
WIRE 624 208 496 208
WIRE 688 -32 336 -32
WIRE 688 16 688 -32
WIRE 688 128 688 96
WIRE 688 160 688 128
WIRE 688 544 496 544
WIRE 688 544 688 256
WIRE 752 128 688 128
WIRE 864 128 816 128
WIRE 864 288 864 128
WIRE 864 432 864 368
WIRE 864 544 688 544
WIRE 864 544 864 512
FLAG -400 592 0
SYMBOL pnp -32 176 R0
WINDOW 0 51 33 Left 0
WINDOW 3 48 63 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N5087
SYMBOL res 16 336 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap 176 272 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 1e-6
SYMBOL pnp 272 240 R0
SYMATTR InstName Q2
SYMATTR Value 2N5087
SYMBOL res 320 16 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res -112 336 R0
SYMATTR InstName R3
SYMATTR Value 1e6
SYMBOL cap -128 208 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C2
SYMATTR Value .01e-6
SYMBOL res -208 208 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL voltage -400 288 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 1 1000)
SYMBOL res 176 16 R0
SYMATTR InstName R5
SYMATTR Value 470k
SYMBOL res 208 336 R0
SYMATTR InstName R6
SYMATTR Value 50k
SYMBOL cap 448 192 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C3
SYMATTR Value 1e-6
SYMBOL res 480 336 R0
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL pnp 624 160 R0
WINDOW 0 43 34 Left 0
WINDOW 3 57 63 Left 0
SYMATTR InstName Q3
SYMATTR Value 2N5087
SYMBOL res 848 272 R0
SYMATTR InstName R8
SYMATTR Value 22k
SYMBOL res 848 416 R0
SYMATTR InstName R9
SYMATTR Value 22k
SYMBOL cap 816 112 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C4
SYMATTR Value .0033e-6
SYMBOL res 672 0 R0
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL voltage -544 400 R180
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 9
TEXT -578 616 Left 0 !.tran .1