Hello Killian13th, Welcome to EasyEDA. To get started in EasyEDA, please see the Tutorial: https://easyeda.com/Doc/Tutorial/ This will help you do the schematic capture, assigning packages to your chosen parts and then passing the design to PCB for layout.

This might help: https://easyeda.com/andyfierman/NE5534_basic_PA-7rDdMKkUS See also: https://ludens.cl/Electron/audioamps/AudioAmps.html :)

Thank you mate! :)

Hello sir,I just want to ask. Is it okay to change the transistors? Instead pf BC637 in Q1 I will use PN2222ATF also instead of BC640 I will use BC557?Is that okay?

If you just want to draw the schematic and turn it into a PCB then that's fine. If you want to re-simulate it with different parts then you need to understand how to do simulation in EasyEDA. In EasyEDA there are many, many more schematic symbols that do not have simulation models associated with them than those that do so it is tricky to find the ones that you can actually use in simulation. However, help is at hand. 1) First you are **strongly** advised to read *and go through the examples* in the `EasyEDA Simulation eBook` at: https://docs.google.com/document/u/1/d/1OWZVVFRAe_2NW3WratpkA_SGuHa5AcRow5ZRfvcoVTU/pub (Please use this in preference to the one on the EasyEDA pages as the table of contents is broken in that one.) 2) Note that all the symbols in the EasyEDA Libs in the left hand Navigation panel have models associated with them and can have different models assigned to them as described in the Simulation eBook. You will find a list of all the spice models and subcircuits currently available for EasyEDA here: https://docs.google.com/spreadsheets/d/1KM28xzXwgQeUUj3zRMlth9BN-vs6Q98KBk1FHXmf58U/pubhtml As described in the EasyEDA Simulation eBook you can enter these model names into any approriate symbol from the EasyEDA Libs and then set the spice prefix to the prefix approriate for the model (Ngspice model types: https://docs.google.com/document/u/1/d/1OWZVVFRAe_2NW3WratpkA_SGuHa5AcRow5ZRfvcoVTU/pub#h.3hv69ve) You will find all other available spice symbols here: https://easyeda.com/component/user/spicesymbol or separated into those for models and those for subcircuits here: https://easyeda.com/component/user/model https://easyeda.com/component/user/subckt

As a practical point, I hope you are not looking for anything even faintly resembling HiFi out of this amp because, unlike the BC637 and the BC640, the 2N2222 and the BC557 are in no way similar or even remotely complimentary. https://www.fairchildsemi.com/datasheets/PN/PN2222A.pdf https://www.fairchildsemi.com/datasheets/BC/BC557.pdf The basic design is not suitable for HiFi anyway but using such widely mismatched bjts will only make it worse. :)

Tsk.I see...I really need to make an amplifier for my school project. Those two transistors(BC640 & BC637) are not available in near electronic shops here in our place, that's why thinking that maybe I could change the transistors. Thank you so much for your help!:)

I change the transistors.I dont know if it's right. https://easyeda.com/killian13th/NE5534_basic_PA-QOIoiAuM4

Sorry but if you don't make your project public no-one but you can see it: https://easyeda.com/Doc/Tutorial/share.htm#Sharing

Can you get 2N2907 bjts? They are a pretty close complement to the 2N2222.

Where in the world are you? What parts suppliers do you have access to? Probably not the cheapest or fastest supplier for you but you could try: http://www.bitsbox.co.uk/index.php?main_page=page&id=17 who can supply: MPSW06/MPSW56 complementary pair: http://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=140_151_152&products_id=1046 http://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=140_151_153&products_id=1047 or BD139/BD140 complementary pair: http://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=140_151_152&products_id=1009 http://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=140_151_153&products_id=1010 * MPSW06/MPSW56 and BD139/BD140 Symbols and models are now in EasyEDA. A suggestion: If there are a few people at your school doing the same project (5? 10?) then it might make sense to do a complete design including PCB layout, order the PCBs from EasyEDA **and** ask for the parts to be supplied by - and maybe even have the boards assembled - by EasyEDA. That way you may have access to a wider choice of parts and a low cost way to make PCBs.

Hello, sorry for the late reply. Yes, we have the same project but different type of amplifier. I tried TDA7297 IC base on the amplifier kit sold in ebay. I just followed the schematic diagram but I'm not sure if it's gonna work. Thank you so much for helping. BTW.Im from Philippines that's why finding the components are too hard.