Design and build a transistor capacitor multivibrator circuit
PCB design software:️ https://www.altium.com/asp/the-engineering-mindset/
Only $2 for 5pcs 2 Layer & 4Layer PCBs, Get SMT Coupon Here :️ https://jlcpcb.com/cyt

Download the PCB file:️ https://theengineeringmindset.com/transistor-capacitor-pcb-download-eng/

Parts list:
S1 - switch EG1218
R, R2, R4 resistor - 22 Ohm https://amzn.to/3ED8NCn
R1, R3, R5 - resistor 22 kohm https://amzn.to/3ED8NCn
Q1, Q2, Q3 - transistor BC547 https://amzn.to/3EdU7ck
LED 5mm Red https://amzn.to/3Iu2vam
LED 5mm Yellow https://amzn.to/3Iu2vam
Capacitor 100uF https://amzn.to/3k6b5mh
Battery holder https://www.digikey.co.uk/short/3m2h327z

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Diodes:️ https://youtu.be/Fwj_d3uO5g8
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ELECTRICAL ENGINEERING
How electricity works: https://youtu.be/mc979OhitAg
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Fan and motor calculations: https://youtu.be/rl-HQRzL-kg
HVAC Cooling coils: https://youtu.be/oSs-4Ptcfhk
Cooling towers: https://youtu.be/UzHJWNL2OtM

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Refrierant retrofit guide: https://youtu.be/1OqgLcU2buQ
Refrigerant types, future: https://youtu.be/J77a0keM2Yk
How refrigerants work: https://youtu.be/lMqoKLli0Y4

HYDRONICS
Primary & Secondary system: https://youtu.be/KU_AypZ-BnU
Pumps: https://youtu.be/TxqPAPg4nb4
Pump calculations: https://youtu.be/99vikjRrlgo