Germanium Transistor Amplifier Circuit

Once AD161-AD162 I had an experiment with pair. I still use almost every day. At first I didn’t like the sound, but I like listening to. The frequency of particular speech sounds very clear and is understandable.

Quite a while (probably has been for eighteen years) and two ad162 ad161 a pair of them in my hand I was looking for a cooler appropriate.

Thanks to our friend s in the hands of AD162 sent and thus we set to work. Our expectations were not very high even though we have to use what we have and we became the owner of both a classic amplifier.

Amplifier Circuit

After searching quite fit in with the existing heatsink clips decisions I began drawing in the diagram below. The same circuit to keep the cooler in two symmetrical again had to draw the opposite, I also made a few changes to the scheme.

Firstly, the 6.8 nf capacitor specified on the circuit with the Feedback resistance cizirdayip didn’t work just stopped. When you put something improved or even completely canceled, I went around instead of 470pF. AC153 we also tried both with BC327 instead of BD140.

Here, the transistor is getting a bit toasty, we have to put it somewhere cooler will contact superficially.

The circuit is configured as completely independent from each other on a single plaque.

Each channel is fed with separate power supply.

The solder side of the circuit and layout was printed by the screen printing method.

But the layout is captured is not entirely clear to print the mold, and the pressure was not smooth, but this will do just as well, ultimately DIY job.

B seems a bit too high for my eye heatsinki the wings a bit. 🙂

Due to the lack of space, we put some parts to solder to the face.

Meanwhile, I used a different method to cover the copper paths.

It was the first time because it wasn’t very good, but in the future can be developed.

Solder the solder liquid mud cake sold as solder, copper solder and a small box of lots of random roads I drove.

Close with a thin aluminium layer on top of the iron.

When I started to take the form of grey matter melt solder iron thoroughly until all paths above kaplayıncaya Dixon and I continue, but look around the small ball (PIN) a lot of in the form of a solder. Finish cleaning up around the event without more dangerous. In the meantime, just completely fried PCB, some of the fine print over a little. Next time, try a hot air gun with sound could be better.

As a result, this article cannot possibly profit in a short period of time, the pie into the solder to heat ulaştırılıp again in a very short period of time should be left to cool right now whether to finish a job.

One of the most noteworthy aspects of the transistor and the heatsink Assembly.
The output transistors on the heatsink needs to be properly insulated because all of them are all the same.

We choose a suitable material as a thermal insulation material, or if we find any, we’ll take the thermal pad.
Poke holes with a utility knife and put it on the cooler we’re opening up.

The cooler the transistors through a portion of suitable diameter to avoid contact with the screws of the screw with a piece of insulating cable or macaroons.