SPECIFICATIONS

Brand Name: ElecDemo

High-concerned chemical: None

Origin: Mainland China

Power supply voltage: Maximum ±18V

Size: 50mm*50mm

Type: Other PLC Peripheral Modules

Highlights：

Layout is regular, strictly according to the filter circuit design to layout and wiring, generous materials, can complete various filtering functions, easy to use, suitable for student competition module and personal project development.

UAF42 module shipping list

Module + PDF schematic + after-sale technical support + electrostatic bag packaging + shockproof foam

Tips:

 

(1) The module interface of our shop is clear and the performance is stable. Please perform functional verification under the corresponding experimental conditions in conjunction with the schematic diagram provided by our shop.

 

(2) The basic parameters of this module are in the details page, providing PDF information of the module information; engineering documents are not provided, please be clear to the buyer, if you have operational problems, you can consult customer service.

 

(3) Buyers, before using the module, please read the details page of this module to understand the power supply and use restrictions, to avoid damage to the module due to improper operation.

 

(4) Our modules are guaranteed to provide real module parameters, functions and pictures, and all modules will be shipped after detection.

 

 

 

Module parameters

 

 

Module model: UAF42

Module type: universal adjustable filter

Supply voltage: ±5V-±15V

Module current: 10mA (Max)

Module control mode: potentiometer

Filter type: high-pass, low-pass, band-pass; the center frequency can be customized according to customer requirements

Low-pass cut-off frequency range: 100KHz (MAX); the default potentiometer cut-off frequency range is within 5K; the maximum cut-off frequency is not supported, users need to replace the RF1 and RF2 potentiometers according to their own needs

Qualcomm cut-off frequency range: 30KHz (MAX); the default potentiometer cut-off frequency range is within 2K; the maximum cut-off frequency is not supported, users need to replace RF1 and RF2 potentiometers according to their own needs

Bandpass center frequency range: 50Hz-40KHz; the default potentiometer cut-off frequency range is within 500Hz-5KHZ; the minimum and maximum center frequencies are not supported, users need to replace the RF1 and RF2 potentiometers according to their own needs

Input signal form: single-ended; default VIN2 input

Input signal voltage range: less than positive and negative power supply

Input frequency range: DC-1MHz

Module gain range: 40dB (MAX)

Quality factor Q value adjustable range: 20 (MAX)

Input and output signal characteristics: DC input and output; output with DC component, please add DC blocker to the radio frequency equipment, or directly use oscilloscope

Module input and output interface: SMA; 24-hour salt spray anti-oxidation

Module protection: none; no reverse connection protection, unlimited current protection

Customized parameters: yes

Module features: multi-function filter, universal adjustable filter

Module application: power system, sensor signal processing, transmitter and receiver, signal generator

Module specifications: 50*50*15mm; length*width*height-PCB size

Module weight: 20.6g

Module working temperature: 0-75℃; civil grade

 

 

 

Module description

 

 

UAF42 is a universal active filter that can be configured for various low-pass, high-pass, and band-pass filters. It uses a classic state-variable analog architecture with an inverting amplifier and two integrators. The integrator includes an on-chip 1000pF capacitor trimmed to 0.5%. Many filter types can be easily implemented, such as Butterworth, Bessel and Chebyshev. A fourth useless FET input operational amplifier (same as the other three) can be used to form additional stages, or for special filters such as band stop and inverse Chebyshev. Generally used in power system, sensor signal processing, transmitter and receiver, signal generator processing, etc.

 

 

 

Precautions for using the module

 

 

 

 

(1) The power supply of the module is a positive and negative dual power supply, and the voltage cannot exceed 18V.

(2) Since the module is a high-precision device, in order to avoid unnecessary interference, it is recommended to use a linear power supply.

(3) It is recommended to use SMA to BNC line input and output signals for output signals. Use an oscilloscope to observe the effect. Poor contact or poor quality wires may cause signal attenuation or excessive noise.

(4) The filter measurement generally adopts the oscilloscope point frequency method. If possible, you can use a frequency sweeper or a vector network analyzer to test. Please add a DC blocker.

(5) The details in the shop are mainly the introduction of the basic performance of the module and the test chart. If you need the specific working principle and analysis of the circuit, please move to the blog post.

blog.csdn.net/kvdz_taobao_com/article/details/103511208

 

 

 

 

Frequently asked questions

 

 

Q: There is no problem when the module starts to output. After adjusting the potentiometer, even if there is no input signal, there will be an output signal. What is going on?

 

A: In this case, it should be over-adjusted, the module is self-excited; you need to turn RF1 and RF2 clockwise a few more times at the same time, RQ potentiometer can be turned counterclockwise a few times; the center frequency and Q value are reduced, the module You will not be self-excited.

 

Q: Can UAF42 adjust the bandpass from 20HZ to 20KHz?

 

A: No, UAF42 can only be adjusted to a narrow-band filter, for example, 1K center frequency 100hz bandwidth. If a broadband filter is needed, our custom fourth-order filter can do it.

 

Q: The input signal of the module is 1Vpp, the output signal becomes larger, and how to adjust the unevenness in the band?

 

A: If you don't need to amplify, you can use channel 1 output. The gain can be controlled by RG potentiometer. The unevenness in the band is generally too high Q value. Adjust the Q value counterclockwise to reduce the in-band fluctuations.

 

 

 

About Elecdemo:

Elecdemonded in 2015 , Elecdemo is a well-established technology company that integrates supply , R & D , prodund sales , supporting agents , franchises , customization and bulk purchases . We are committed to provid our customers with the best electronic functional module products at the lowest price . We have a professional design and production team to providecustomer service to help our customers greatly improve the efficiency of development，learn and research.

About Transpiration:

1. Global shipping, (except for some countriesand APO/ FPO)

2. Import duties: Taxes are not included in theprice or shipping costs. Customs fees are the responsibility of the buyer.

3. If the package is not delivered within 30 days. please contact us. We will help you solve the problem.

About Delivery:

1. We will process the order in time after the payment is confirmed. Due to the difference in inventory status and time, we will choose to ship from our first warehouse for fast delivery.

2. We only send to the confirmed order address. Your order address must match your shipping address.

3.Service transit time is provided by the carrier, excluding weekends and holidays. Delivery time may vary, especially on holidays.

About guarantee:

1.  manufacturers limited warrantyon defective items(excluding items damagedand/or misused after receipt). The accessory is backed by a 3 month warranty

2. The displayed image is taken in real time, but due to different production batches, thecolor may be different. The picture is for reference only, and the actual object is subjectto the final one

3. The defective item must be reported and reurned within the warranty period(if possible,in the original packaging

4. If the product features do not match the advertisement, we will bear all shipping costs.

About feedback:

1. If you are satisfied, please leave 5 stars positive feedback, we are very honored to receivea generous real assessment and photos, th !!!!

2. For any product or shipping problems, please contact us before opening a dispute orleaving any feedback/negative feedback, we will try our best to solve the problem untilyou are satisfied.

Returns and refunds:

1. You have 7 days to contact us and you will not be able to return from the receipt date after30 days. If the item has been owned by you for more than 7 days, it will be considered usedand we will not refund or replace it. with no exceptions! Return shipping costs are theresponsibility of the buver.

2. All returned items must be in original packaging, you must provide us with a shippingtracking number.

3. If there is a return, please contact us in advance, we will help you solve it. If it cannot besolved online, we will accept your return and refund it to you.

We stand behind the quality of our products. This item comes with a limited warranty that protects against defects in materials and workmanship under normal use.

Coverage Details

• Covers manufacturing defects and material failures
• Valid for the period specified on the product or receipt
• Applies only to the original purchaser
• Excludes damage caused by misuse, accidents, or unauthorized repairs
• Proof of purchase may be required to make a claim

How to Claim

• Contact our customer support team with your order details
• Provide a description of the issue and photos if applicable
• Follow the instructions for returning the item or receiving a replacement
• Claims are processed within 5–10 business days after the item is received

Additional Notes

Please handle items carefully and follow usage instructions to maintain warranty coverage. For questions about coverage or claims, contact our support team.

We are committed to delivering your orders quickly and safely. All shipments are processed within 1–2 business days of receiving your order, unless otherwise specified. Delivery times may vary depending on the shipping method, location, and product availability.

Shipping Methods

• Standard Shipping: 3–7 business days
• Expedited Shipping: 1–3 business days
• In-Store Pickup: Available for select items at participating locations

Order Tracking

Once your order has been shipped, you will receive a confirmation email with tracking information. You can monitor the delivery status at any time using the tracking number provided.

Shipping Restrictions

• We currently ship only within the specified countries listed at checkout.
• Certain items may not be eligible for expedited shipping or in-store pickup.
• Delivery times are estimates and may be affected by weather, holidays, or carrier delays.

Additional Notes

Please ensure that your shipping address is correct and complete to avoid delays. We are not responsible for lost or delayed packages due to incorrect information or carrier issues.

We want you to be completely satisfied with your purchase. If you are not happy with your item, you may return it within 30 days of receipt for a refund or exchange, subject to the conditions below.

Eligibility for Returns

• Items must be unused, in their original packaging, and in resalable condition.
• Proof of purchase, such as a receipt or order confirmation, is required.
• Some items, including perishable goods or personalized products, may not be eligible for return.

How to Return an Item

• Contact our customer support team to initiate a return.
• Pack the item securely in its original packaging or equivalent.
• Ship the item to the provided return address using a tracked shipping method.

Refunds and Exchanges

• Refunds are processed within 5–10 business days after the returned item is received and inspected.
• Exchanges will be processed once the returned item is approved and the replacement is shipped.
• Shipping costs for returns may be the responsibility of the customer unless the return is due to a defect or error on our part.

Additional Notes

Please ensure that items are returned safely to prevent damage during transit. Contact our support team if you have any questions or need assistance with the return process.

We are committed to making eco-friendly choices that reduce our environmental impact. From responsible sourcing to sustainable packaging, every product is designed with the planet in mind.

Our Sustainable Practices

• Products made with recycled or responsibly sourced materials
• Packaging designed to minimize waste and be recyclable
• Energy-efficient manufacturing processes
• Carbon footprint reduction through eco-conscious shipping
• Support for environmental programs and initiatives

How You Can Help

• Recycle packaging after use
• Choose items marked as eco-friendly or sustainably made
• Consider consolidated shipping to reduce emissions
• Share sustainable practices with your community

Here are answers to some of the most common questions about this product. If you don’t see your question, feel free to contact our support team.

1. How long will delivery take?

Delivery typically takes 3–7 business days depending on your location and the shipping method selected at checkout.

2. Can I return the item if I’m not satisfied?

Yes. Items can be returned within 30 days of receipt, provided they are in original condition and packaging. See our Return Policy for full details.

3. Is this product covered by a warranty?

Yes. The product comes with a limited manufacturer’s warranty that covers defects in materials and workmanship. Refer to our Warranty Policy for details.

4. Can I track my order?

Absolutely. Once your order has shipped, you will receive a confirmation email with tracking information to monitor its progress.

5. Who should I contact for technical support?

For setup, troubleshooting, or other technical questions, please contact our Technical Support team via email or phone. Details can be found in the Technical Support tab.