A huge thankyou to Hevans ---you are a true soldier!
Your superb advice will be truly appreciated --
apologies for my primitive approach /backwoods ideas --
but the house breaking burglaries prompted me to make a whole lot of battery chargers for my DIY--alarms I have installed in a dozen...
You are a superstar --Audioguru ---a magician !
so very grateful ----appreciate
( I Successfully -------sorted out that TIP circuit horror)
last night --all night --replaced the 122 with TIP 41 C
NPN specs data say its close to 122-
took a chance --trial &error ---
connected the pins as per...
I think I am not going to get a schematic or circuit here --using that rectifier bridge
modem ----- and all its controlling components --to give a reliable 13 .6 volt -one amp charging output-
Have searched the web exhaustively--- for such a circuit --must be wishful thinking--but will keep...
Thankyou so much hevans ------
wow !---simply a man I can really admire --straight from the school of "if at first --failure -try again &again & again
I am a wildlife painter /taxidermist /bowhunter /guitarist /musician /guitar builder /wood turner -
(born 1949 )
Simply crazy about electronics...
Steve --here are macro fotos I took --
of how I have interpreted your method of testing Zeners---
probably not too good --
1Used 12 VOLT m/cycle battery
connected 2 zeners I assume are the real Mc Coy ---
One is marked 12 ( volts?---the other 6 )
used a 22 k resistor --in series with each...
Many Thanks Steve ---
will keep trying to figure out reverse & forward bias --!everyone of a hundred diodes I have removed painfully from old PC boards -----
tested using a SINGLE 12 VOLT m/cycle lead acid battery --brand new ---
10 k ohm in series with the Zener "lookalikes'
All seem to give...
Wow ---thankyou Hevans 1944---!
Really appreciate all the trouble you have gone to ---to teach me important facts about Zeners-----
I am learning this complex field stubbornly --not all of us are gifted geniuses
I love circuits --been building them 4 - circa 25 yrs ---albeit direct from...
ok
----
ok------Thanks again Audioguru
That TIP 122 /zener set up --as you say -is-possibly-- a 3rd world (probably Swagatam nightmare)
I tried one of his ("simple FM radio circuits ---few years ago)
It even baffled a PH d ---expert on this forum ---he concluded same as--you have--...
Thankyou so much for all this info Hevans !
I still cannot IDENTIFY a one watt Zener 12 volt --!
Your lesson on its function /characteristics etc is way too complex -
but I do understand a bit here & there --"reverse breakdown voltage & forward operating region I will never grasp ---way too...
Audioguru ----
you were right on ---I messed up big time ! How I could connect the middle pin (collecter )
to the Zener --is plain blind stupidity --forgot completely how I made audio amps from this TIP122-many years ago !( without a problem )
So I had to reconfigure the connections ----I got...
OK ---Thankyou Audioguru ---
if I connected the TIP incorrectly --
can you show me how to connect another TIP 122 ( I have many spares)
I have found a fat one watt zener glass diode ---but not sure what voltage --reads 12 v one way --4-5 voltsv the other way ---
is this 7 or 8 volt Zener ?
I am...
So now I am again in the dark ---
if forward volts are 5.6 --reverse voltage is what/?12 VOLTS ?
AND how come I connected the TIP leg pins wrong ?
I followed the schematic exactly as it was shown ---
middle leg to zener -----
left leg receives volts from rectifier diode bridge --
right leg is...
Sincere apologies Steve --I meant one watt ----you said bit bigger ---
OK voila !!
searching carefully ---I found 2 slightly broader in girth ---glass diodes with odd markings -
(see fotos)
Astounded! when tested your method ---
they show TWO voltages --one way -then the other --precisely as...
WOW ---Audioguru ----
you certainly got the EXACT TIP 122 circuit I have made!
--What I did --to get 13 .4 volts -----output ---
was
1 --replace the ZENER DIODE on middle leg of TIP transistor
with large rectifier black diode ( IN 4007 or similar )
2 ----removed the LED ---& I K ohm...
wow !! ---those 2 X9V BATTERIES ---10 K RESISTOR idea /method is a killer !! works SUPERBLY --
GOT 4 .5 VOLTS ON ONE glass diode ( tiny )
5 .8 volts -7 volts on others --some read 2 -3 volts only !
proves some are Zeners ---the others I knowq are IN 4007 and 4001 STD rectifier diodes
not...