Punisher Debugged I think.

[petemoore]

  Yupp, looks right...
  K...batter measures 9.40VDC
  This computer is really tuff, I'm going to post these V's in case I can for now, looks like I got it going though.
  Now that I've typed all this, I was testing around a bit as I looked at the schematic, and have posted.
  Typing out the problem seems to help sometimes, I had a N/C at diode to OA output, now it seems the voltmeter is having trouble tracking the output voltage, when I grab the input wire the voltage drops !!!
  Looks to be well adjustable too.
  I figured I'd just modify this post into I think it's a success, and hope to have it's output connected to a DC jack and the input...I'm thinking about just tapping the input with a separate wire from the effect.
  I used 15k Voltage divider resistors, I suppose I should dress them with 47uf or so caps to keep the supply voltage clean.
  It looks like a success, I cant' wait to try it out!
   OA
1: 8.67      5:  1.77
2: 8.71      6:  1.77 {I know, but I checked for N/C between pins 5/6
3    .21      7:  1.71
4     .0       8:  9.40
2n5089
C: 3.44
B: .21
E:  .O
  2n5457
D:  9.20
S:  4.59
G:  3.43
LED to Ground
A: 0v
C 1.77v
LED Might be fixed was A:0v C:.12v
Si Diode: .02v C:0v

[petemoore]

  What influence will having the audio path [which could be guitar pickup] connected to the input of a buffer have? Will this change the response of a FF?
  Also, STM if your'e seeing this, the 100k trimpot between V+ and Jfet D, any tips on how to set this, I found that the Punisher works when this is 'set'...by eyeing the DMM Volt readings while doing the 'touch touch' on the input, thumb as source...lol...I'm thinking fix the min. resistance then add a 10k or 20k pot? or is this just as well a fixed value and let the other two controls be box mounted.
  I've not yet decided on the actual jack wirings, the voltage stays nice and steady @ say...8v or so if set to do so...
  And suggest/ask if an SPST switch might be a good option to lift the input, so it would = no loading, and for many circuits this would supply enough to not impinge on the headroom, functionally an SPST 'true bypass'?

[petemoore]

  Seemed like it was for a time...anomoly or something else, put it in a box and...lol..here' voltages
  9.38vdc battery
JRC4558
8    8.52
7   1.12
6   .48
5   1.34
4   0
3   .21
2   ~6 or 7 v
1   same as 2

2n5089
C  3.16
B  .26
E   0
2n5457
D   4.64
S   3.97
G   3.97 [nope S/G arent' connected...
LED from ground Ov / 1.78v anode
LED from OA output .02 anode / .26 cathode
Si diode: .26, cathode .8

[petemoore]

http://www.fairchildsemi.com/ds/2N/2N5459.pdf
  I just checked the 1rst capacitor, it works, marked 10n = .01uf, it connects to the 1k [I used 1k2 because that's what I had], that 1k2 connects to pin 3 of the opamp.
  Pin 2 is wired to pin 1, these pins feed the Sens. pot, 100k linear.
  the Sens pots CCW lug is at ground, the wiper goes to another .01 I just checked, it's marked 10n, this is connected to the 10k/2m2/negative input = pin6 of OA b. The other end of the 2m2 is connected to the first LED's anode, #1 LED's cathode to 100R, 100R/1n4148 anode/10uf.
  1n4148 cathode to Range pot Cw lug, CCw lug grounded, Wiper feeds base through the 10k.
  Emitter grounded, collector/gate/1k connected, 1k to Vcc = voltage divider.
  I'm using the source as power output, Drain as power input via 100k trimpot.
  All connections stated have been verified with the DMM, twice or more.
  All resistances measured, the 14.47k/14.50k voltage divider doesn't give 1/2 V, more like 1/3v, 3.38v w/9.38v battery. All pots work great, I measured them, only the 100k trim influences voltage, and this produces a nice voltage regulator effect.
  And the 10k from OAb's + input goes to V divider.
  I used 1k2 instead of 1k at the input, and I'm using mini sized red LED's. Everything else I can measure has been measured, the grounded LED lights steady, the OAoutput LED blinks only  when the Sens pot is swiftly rotated past 2.
  I can't understand why two very very close to equal resistors strung across the rails produces close to 1/3 voltage.
  Every connection has been verified as good and lonely.
  Every resistance has been measured to be within +/- 10% of stated value, except the 1k @ 1k2.
  The LED's light and test good.
  The capacitors were working just before installation.
  Am I trying to verify this circuit?
 

[petemoore]

Vbias is now sitting @3.43v of 9.+V,
  Don't know why, but I moved the 1k from emitter to collector [as shown on the schematic] and there it goes !
  Looks like a nice drop from X voltage to X voltage, then rises up again quickly/not so quickly..ok..enough debugging, looke likey I got this one working...here's goes the applications !!
  I will swear typing this out, re-reading and re-typing it, thinking of how stupid it sounds etc. has made a difference in the debugging process. I didn't know I was going to be the one to figure it out until I did !!! ...er I think I did..lol..we'll see what this V drop thing does to...some gain circuits.
  What could be making the ~14k47 resistors provide ~1/3 instead of 1/2v?
  Two jack tips, one with a guitar cabled in it, volume up, plugged in, or, just the wire to the .01uf connected/disconnected to my thumb as source, confirmed.
  1k to + input confirmed, no pin shorts on the opamp except of course pins 1 and 2, which connect to the 100k pot, wiper feeds .01uf confirmed, other side of .01uf connects to 10k, 10k R measured between .01uf and negative input [I'm using a dual opamp so I'm disregarding the pin numbers on the schematic] of OA1b/2m2 meg. other end of 2m2 connected to OA1b output/Red Led Anode.
  OA1b + input gets red LED anode [cathode to ground] and 10k [to voltage divider].
  LED#2 cathode to 100R [measured] to 10uf/1n4148, the - of the 10uf to ground, the new 1n4148 to range pot, wiper of range pot to Base, CCw lug of range pot grounded. Emitter grounded.
  Collector/Gate/1k connection confirmed, 1k to middle of voltage divider.
  Power in to pin 8, ground to pin 4, V+>100k>Drain connection.
  Source is DCVout, and is supposed to wiggle when input is wiggling, if the pots are turned a certain way...but no wiggly output, just voltage regulation via 100k trim with Jfet disoriented.
  So, as far as I can tell I've tested every connection, measured every resistor, used caps that were just working and the LED's are good, opamp was working, 2n5089 just came from a BMP was working, Jfet is a new one, I've re-verified the pinout according to the data sheet, which is same as J201.
  All grounds, all V+'s, everything as it should be except the thing that shouldn't be...lol.
  I used two 15k's strung across V rails to make a voltage divider.
  Ha !!1 Vbias is now sitting @3.43v of 9.+V, daft !!! Brb...