Any US source for inexpensive germanium transistors?

[default]

I wanted to try an idea appearing in Electronic Design (May 10 07)
calling for an NTE 103 (TO5 NPN Ge)

They claim a DC/DC converter that will unconditionally start
oscillating at ~260 millivolts.

It is a basic Eccles/Jordan flip flop with inductors in place of load
resistors for voltage boost. They take output from both sides of the
flip flop for higher current and low ripple. They also give a
suggestion for using a JFET to turn it off (providing you have the
voltage to do it).

Most of what I see for prices are in the $5-7 each for germanium
transistors and the basic oscillator takes a pair of them - which
prices them out for the numbers I was thinking.

NPN Ic of 100 ma to 500 ma, gain of ~100, 30 volt standoff would work.

PNP would also work but somewhat less desirable.

 

[Eeyore]

I wanted to try an idea appearing in Electronic Design (May 10 07)
calling for an NTE 103 (TO5 NPN Ge)

They claim a DC/DC converter that will unconditionally start
oscillating at ~260 millivolts.

It is a basic Eccles/Jordan flip flop with inductors in place of load
resistors for voltage boost. They take output from both sides of the
flip flop for higher current and low ripple. They also give a
suggestion for using a JFET to turn it off (providing you have the
voltage to do it).

Most of what I see for prices are in the $5-7 each for germanium
transistors and the basic oscillator takes a pair of them - which
prices them out for the numbers I was thinking.

NPN Ic of 100 ma to 500 ma, gain of ~100, 30 volt standoff would work.

PNP would also work but somewhat less desirable.

http://business.search.ebay.co.uk/g...ustrial_W0QQcatrefZC12QQfromZR40QQsacatZ12576

http://business.search.ebay.com/germanium_Business-Industrial_W0QQcatrefZC12QQfromZR40QQsacatZ12576

Graham

 

[John Popelish]

I wanted to try an idea appearing in Electronic Design (May 10 07)
calling for an NTE 103 (TO5 NPN Ge)

They claim a DC/DC converter that will unconditionally start
oscillating at ~260 millivolts.

It is a basic Eccles/Jordan flip flop with inductors in place of load
resistors for voltage boost. They take output from both sides of the
flip flop for higher current and low ripple. They also give a
suggestion for using a JFET to turn it off (providing you have the
voltage to do it).

Most of what I see for prices are in the $5-7 each for germanium
transistors and the basic oscillator takes a pair of them - which
prices them out for the numbers I was thinking.

NPN Ic of 100 ma to 500 ma, gain of ~100, 30 volt standoff would work.

PNP would also work but somewhat less desirable.

Search [germanium] on eBay.

 

[whit3rd]

I wanted to try an idea appearing in Electronic Design (May 10 07)
calling for an NTE 103 (TO5 NPN Ge)

They claim a DC/DC converter that will unconditionally start
oscillating at ~260 millivolts.

Or you could go to even lower voltages, by going back to
Model A-style spark coils (yes, a mechanical buzzer... a.k.a.
a vibrator).

It would be more interesting if there were some kind of
power supply that was useful at 260 millivolts. Solar cells
is the only candidate for that role, and you can series-connect
a dozen of 'em easier than this workaround.

 

[Robert Baer]

I wanted to try an idea appearing in Electronic Design (May 10 07)
calling for an NTE 103 (TO5 NPN Ge)

They claim a DC/DC converter that will unconditionally start
oscillating at ~260 millivolts.

It is a basic Eccles/Jordan flip flop with inductors in place of load
resistors for voltage boost. They take output from both sides of the
flip flop for higher current and low ripple. They also give a
suggestion for using a JFET to turn it off (providing you have the
voltage to do it).

Most of what I see for prices are in the $5-7 each for germanium
transistors and the basic oscillator takes a pair of them - which
prices them out for the numbers I was thinking.

NPN Ic of 100 ma to 500 ma, gain of ~100, 30 volt standoff would work.

PNP would also work but somewhat less desirable.

Well, you would be hard pressed to find NPN Germanium transistors,
period.
The few sources i have seen do not quote quantity prices, mainly most
buyers seem to be hobbiests.

 

[Rich Grise]

Well, you would be hard pressed to find NPN Germanium transistors,
period.
The few sources i have seen do not quote quantity prices, mainly most
buyers seem to be hobbiests.

Hobby, hobbier, hobbiest?

It's HOBBYIST!!!!

Thanks,
Rich

 

[Don Klipstein]

I wanted to try an idea appearing in Electronic Design (May 10 07)
calling for an NTE 103 (TO5 NPN Ge)

They claim a DC/DC converter that will unconditionally start
oscillating at ~260 millivolts.

It is a basic Eccles/Jordan flip flop with inductors in place of load
resistors for voltage boost. They take output from both sides of the
flip flop for higher current and low ripple. They also give a
suggestion for using a JFET to turn it off (providing you have the
voltage to do it).

Most of what I see for prices are in the $5-7 each for germanium
transistors and the basic oscillator takes a pair of them - which
prices them out for the numbers I was thinking.

NPN Ic of 100 ma to 500 ma, gain of ~100, 30 volt standoff would work.

PNP would also work but somewhat less desirable.

Keep in mind that it has appeared to me that for germanium PNP is what
is/was more common and available over a wider range of specifications. I
am aware that NPN is more common and being the one exclusively available
for some ratings for silicon.

- Don Klipstein ([email protected])

 

[LVMarc]

Keep in mind that it has appeared to me that for germanium PNP is what
is/was more common and available over a wider range of specifications. I
am aware that NPN is more common and being the one exclusively available
for some ratings for silicon.

- Don Klipstein ([email protected])

I have many ge transistrs contact me and we'll figure out a part number
and ship

Marc
[email protected]