Bride of Zen problem

[arold19]

Hello, I began to built the Power supply of the bridge of Zen today and I have problem !!!
At the output of the power suppluy, I have only 47 V !!!!!
At the output of the bridge, I have 93 V !!! I have 69V AC at the output of the transformer, , more than on the shema but the output of the power supply is "unload"
I use the TIP29CFS of DIGIKEY.... maybe it is not the same of TIP29CGE ???
At the base of the TIP29, I have 47 V.... I suppose to have 60....
At the collector, I have 93v
At the emitter, I have 60 v

I need some help !!!! I don't know the problem !!!!

thank you very much !!!

[Elkaid]

Hi, I built several weeks ago a "Bride of Zen" preamp. You can take a look a my thread:

BOZ replacement parts

I use the TIP29CFS of DIGIKEY.... maybe it is not the same of TIP29CGE ???

Since TIP29CFS is obsolete, yes, you can replace those by TIP29CGE.

Concerning you power supply problem, please verify that your transformer's secondarie are correctly connected (Attention to phase, generally identified by a dot). Also, check diodes polarity. I don't know if you're using P2P or PCB technique but if you're using PCB, make sure that your supply wiring looks like this :
I hope this helps

[arold19]

no, it is not a wiring problem because I have 93 v at the output of the bridge.....
Somabody can say me if the Voltage on my TIP29 is normal ????

[till]

Yes, if you have 47V at the base of the tip, you will see a little less than 47V at the output of the power supply. This only means your PS is working. If you want 60V instead of 47V you have to check the zehner diode chain. at the point between the zehners and R1, at the base, you need 60,6V. Maybe you mounted a zehner wrong way, or it is defective. Use a Voltmeter and measure beween every zehner diode in the chain. What voltages do you read?

[arold19]

The zener are OK because I have 60 V at the emitter, across C2 !!!!
and I have 33V across R1 ..... 93-60=33
The probleme is not the zener !!!
Maybe, the TIP29 is broken by the static ????

[till]

In case you have 60V at the emitter you have 60V at the output of the powersupply. And at the emitter is NOT across C2. across C2 is the base, and in case you have 60V at the base you should have 59,4V at the emitter with a right mounted and not blown TIP29.

I propose you download a datasheet of the transistor and take a look which pin is base, emitter and collector, and check your wireing.
http://www.google.de/search?hl=de&lr...asheet&spell=1


From what you tell i feel you mixed up the pis and mounted the transistor wrong way.
http://www.elektronik-kompendium.de/...t/02012911.gif


It helps to look at the pinout before soldering. It helps to look here http://www.passdiy.com/pdf/brideofzen.pdf
how the device should be connected.
good luck!

[arold19]

Thank you very much..... I inverted the collector with the emitter !!!
Now, I have 59,5 V at the output !!! thank you for your help !!!
I have an other question, I just want to know if the 93V on C1 is a problem, I use a 1000uf 100V by ELNA ???
thank you again !!!!

[till]

much..... I inverted the collector with the emitter !!!

You are not the first who did this....

If you do a search some people in this board say they prefer to use elkos rated at 20 to 100% over the voltage they apply to it. I have no problems using it at the limit, 93V is < 100V so it should work.

[arold19]

Idon't want to have the same problem with the Mosfet IRF610
I look at the data sheet and I don't see what is the GATE pin, or DRAIN pin or Source pins......
anybody know what is the first, second and last pin on the IRF610 ???

[Freddie]

arold19, here you go IRF610 pin-out. You can find that picture in the datasheet......