I couldn't find a similar schematic I almost checked all semiconductors resistors capacitors, but all in vain. Unfortunately, the cover had lost all other information. Assume transistor is Silicon (a-0.98) IE Ic Rp 1.5 kQ Rc 1.2 kn VEE 8. I just replaced them with two BC327, and had to fiddle a bit with biasing, and the audio amplifier worked just fine! The third attemp was trying to repair the audio amplifier of a Siera vintage transistor radio. Complementary metaloxidesemiconductor ( CMOS, pronounced 'sea-moss', /sims/, /-s/) is a type of metaloxidesemiconductor field-effect transistor (MOSFET) fabrication process that uses complementary and symmetrical pairs of p-type and n-type MOSFETs for logic functions. Solution for Problem5: For the common base circuit shown in figure find I. The two output PNP Germanium transistors (MP41)were also damaged. I had another vintage russian VEF 204 radio. I had to add some cooling stuff and luckily there was a quiesent current adjustment trimmer. An SCS is turned on by applying a positive voltage between the cathode gate and cathode.
Typically, the load current through an SCS is carried by the anode gate and cathode terminals, with the cathode gate and anode terminals sufficing as control leads. So I replaced them with BC327 for the AC142, and BC337 for the AC141. A silicon-controlled switch, or SCS, is essentially an SCR with an extra gate terminal. These are hard to get and I needed to get the radio working for somebody who didn't mind modifications, though I prefer vintage repair. I got a Siemens Club RK 231 vintage radio which had two dead audio output transistors AC141/ AC142. It is one of the basic building blocks of modern electronics. The BD135 is one of the transistors in the popular BD series, which also includes the BD131. A transistor is a semiconductor device used to amplify or switch electrical signals and power. It comes with a collector current 1.5A, indicating it can drive loads under 1.5A. It is mainly used for switching and audio amplification purposes.
Hence comparing the schematic symbol to the pn junction in figure 4, we see the anode is the p-type semiconductor and the cathode is the n-type semiconductor. BD135 is a general-purpose medium-power transistor that falls under the category of NPN transistors. If you ever had a vintage gear where you needed to get it to work but needed a replacement for Germanium transistors especially in audio circuits and you wondered if simply replacing with Silicon PNP transistors would work (with some tweaking and minor adjustments), the answer is yes. The circuit schematic symbol of a diode is shown in figure 5.
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