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Description
LIU EENG400L Components KitEENG400L: Electrical and Electronic BJT and JFET Frequency Response: Resistors: 10 , 47 , 560 , 1. 0K , 3. 9K , 2*10K , 68K . Transistor: 1*2N3904 npn. Capacitors: 0. 22F, 1F, 100F, 2*1000F, 3*100pF. Operational Amplifier: Resistors: 2*100, 2*1. 0K , 3*10K , 2*100K, 470K , 2*1M. Op Amp: 1*741C op amp. Capacitors: 2* 1F. Low pass and High pass Filter: Resistors: 1. 5K, 4*8. 2K , 10K , 22K, 27K . Op Amp: 3*741C op amp. Capacitors: 4*0. 0 1F, 2*1F.
EENG400L: Electrical and Electronic
BJT and JFET Frequency Response:
- Resistors: 10 Ω, 47 Ω, 560 Ω, 1.0K Ω, 3.9K Ω, 2*10K Ω, 68K Ω.
- Transistor: 1*2N3904 npn.
- Capacitors: 0.22µF, 1µF, 100µF, 2*1000µF, 3*100pF.
Operational Amplifier:
- Resistors: 2*100Ω, 2*1.0K Ω, 3*10K Ω, 2*100KΩ, 470K Ω, 2*1MΩ.
- Op Amp: 1*741C op-amp.
- Capacitors: 2* 1µF.
Low-pass and High-pass Filter:
- Resistors: 1.5KΩ, 4*8.2K Ω, 10K Ω, 22KΩ, 27K Ω.
- Op Amp: 3*741C op-amp.
- Capacitors: 4*0.0 1µF, 2*1µF.
Colpitts and Hartley Oscillator:
- Resistors: 1.0KΩ, 2.7K Ω, 3.3K Ω, 10K Ω, 10MΩ also 100Ω potentiometer.
- Transistors: 1*2N3904 npn, 1*2N5458 n-channel JFET.
- Capacitors: 2*1000pF,0.0 1µF,3* 0.1µF.
- Inductors: 1*2µH (can be wound quickly from # 22 wire), 1*25µH.
- 1* 1MHz crystal.
Feedback Amplifier
- Transistors: 2N2219A, CD4007
- Capacitors: 0.1 uF, 2*10 uF,
- Resistors:2*10 KΩ, 100MΩ, 390 Ω, 47 KΩ,5 KΩ, 33 Ω,
Feedback - Controlled Amplifier
- Resistors: 100Ω, 270Ω, 1.0KΩ, 2.0K Ω, 47 KΩ, 100KΩ, 10K Ω also 5KΩ potentiometer.
- Transistors: 2*2N3904
- Diodes: 2*1N914.
The Phase Locked Loop:
- Resistors: 1.0KΩ, 2.0K Ω, 10K Ω also 10KΩ potentiometer.
- Transistors: 1*2N3904 npn.
- Capacitors: 1*1000pF,2200pF, 0.1µF, 1µF.
- 1*LM565 phase-locked loop
- 1*7490 decade counter
- Frequency counter
- 1* 1MHz crystal.
Frequency Response of MOS Amplifiers:
- Resistors: 2.0KΩ, 5.1K Ω, 2*10K Ω, 100KΩ.
- Transistors: VN2222LL MOSFET.
- Capacitors: 3* 10µF.
Power Amplifiers:
- Resistors: 2*22 Ω 2 W, 2*2.7KΩ, 2*10KΩ, 56 Ω, 330Ω, 3*33 KΩ, 170Ω, 4*1KΩ, 22 KΩ, 68K Ω, 5 K Ω potentiometer.
- Transistors: 1*2N3904, 1*2N3906, 2*2N2222, 1*2N2907, 2*2N3053 with heat think, 1*2SD1666, 1*2SB1133, 1*BD677.
- Diodes: 4*1N914.
- Capacitors: 0.22 µF, 47 µF, 220µF, 3* 1µF, 100µF, 2200µF, 15µF.
- Small speaker 8 or 16 Ω speaker
Linear Digital ICs
- IC; 555Timer
- Resistors: 8.2KΩ, 2 K Ω,10 K Ω potentiometer
- Capacitors: 0.01 µF, 1000pF, 1uF 2200pF
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
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Product Reviews
★★★★★ 5
Make sure delivery is not with USPS
Color: 6pcs
Product is good quality. The delivery service is the issue. No one should the USPS for anything but junk. Worthless tax payers money paying for the wages of employees who don't want to work at a government business losing billions of dollars a year.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
great product
Color: 6pcs
Works great!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2026
★★★★★ 5
Great quality
Color: 6pcs
Great quality. Almost like original mops.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 8, 2026
★★★★★ 5
Clean mop heads are important!
Color: 6pcs
Fits the eufy Omni C20 robot vac perfectly. Would happily purchase again keep my floors clean
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 14, 2025
★★★★★ 5
Fits and works the same as the original
Color: 6pcs
I like to change my washing pads on the Eufy C20 every Friday (floors are vacuumed Mon, Wed, Fri and get washed on Mon and Fri as well). I will send the mop out too just to do the kitchen once I have had a big cooking session. These fit well and work as well as the original. I'm so happy to have extras as my laundry sometimes take several days to get caught up. Recommended.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 13, 2025
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