Hey guys,
I've took apart an old radio from 60s just recently and got some germanium transistors like AF115, AF117, AC126. I started to search web to find informations about these transistors and found a webpage shows various diy kits (ee8) made by Philips includes a push-pull amplifier example which uses both AF116 and AC126. I decided to build this circuit but it did not work.
Can someone help me to understand why there was +9VDC at both sides of input and tell me if this amplifier is capable of driving 8 ohm speaker or not?
Thanks!
I've took apart an old radio from 60s just recently and got some germanium transistors like AF115, AF117, AC126. I started to search web to find informations about these transistors and found a webpage shows various diy kits (ee8) made by Philips includes a push-pull amplifier example which uses both AF116 and AC126. I decided to build this circuit but it did not work.
Can someone help me to understand why there was +9VDC at both sides of input and tell me if this amplifier is capable of driving 8 ohm speaker or not?
Thanks!
The most common germanium transistors were PNP like these. NPN's were rare back then. The usual case in the 60's was to make the POSITIVE terminal of the battery the common or ground connection. All other voltages are referenced to (measured from) the positive side of the battery and are negative. This is why your input is connected directly to the positive terminal of the battery.
This circuit with it's three small signal transistors was probably intended for a small earphone or a high impedance speaker. The similar GE electronics kits we had in the 1960's used a 600 ohm speaker that was about 3 inches in diameter. It was audible in a quiet room, but definitely not loud.
This circuit with it's three small signal transistors was probably intended for a small earphone or a high impedance speaker. The similar GE electronics kits we had in the 1960's used a 600 ohm speaker that was about 3 inches in diameter. It was audible in a quiet room, but definitely not loud.
@Tubelab_com
All I wanted to do is just to hear a kind of "vintage sound" from this circuit but I suppose it's a bit hard to achieve with these transistors.
I'm actually looking for a fun project to build with germanium transistors, can you recommend me anything you think I should try out?
Thank you!
All I wanted to do is just to hear a kind of "vintage sound" from this circuit but I suppose it's a bit hard to achieve with these transistors.
I'm actually looking for a fun project to build with germanium transistors, can you recommend me anything you think I should try out?
Thank you!
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