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Easy Audio Bandpass Filter Kit - QRP Kits
http://www.qrpkits.com/files/AFBPF_Manual_V4_20160707.pdf
Easy Audio Bandpass Filter Kit Description and Specifications The Audio Frequency Band Pass Filter kit from qrpkits.com provides A basic audio filter kit with preamp, op-amp filter and LM386 audio amp to drive headphones or speaker. It has a peak in audio response that is tunable from approximately 300Hz to 2Khz and has a bandwidth
Bandpass Filter Kits - Thorlabs
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=873
Thorlabs' Bandpass Filter Kits each contain 10 mounted bandpass filters that can be used to transmit a well-defined wavelength band in the visible or IR, while rejecting other unwanted radiation.
Band Pass Filter kit - QRP Labs
http://shop.qrp-labs.com/bpf
This Band Pass Filter (BPF) kit is for receiver input filtering. It uses the popular double-tuned-circuit which is reliable and easy to build, without needing access to any special equipment. Kits are available for 10 HF bands: 160, 80, 60, 40, 30, 20, 17, 15, 12, and 10m.
QRPGuys Active 600Hz Audio Filter - QRPGuys
https://qrpguys.com/qrpguys-active-600hz-audio-filter
There is an onboard switch for inserting the filter or for straight audio through the device. It is a through hole kit and all components are pcb mounted with 3.5mm jacks for input/output. The board is 2.50″ sq. with the 9 volt battery mounted to permanent battery clips.
Ham Supply LogiKit SCAF-1 – Bandpass Filter
https://www.hamsupply.com/logikit-scaf-1-noise-filter/
For troubleshooting hints and help for the SCAF-1 filter, and for warranty and non-warranty repairs, see KØQVF’s site. Pricing and Ordering. LogiKit SCAF-1 Bandpass Filter Kit: $108.95 (Discontinued Nov 15, 2018) LogiKit SCAF-1 Bandpass Filter Fully Assembled & Tested: $148.95 (Discontinued Nov 15, 2018)
W3NQN Band pass filters, W3NQN BPF - Array Solutions
https://www.arraysolutions.com/w3nqn-filters-info
W3NQN Band Pass filters are the best single band filters you can buy. Each one is hand-made by K7MI to W3NQN's specifications. The performance of these W3NQN design filters, regardless of who assembles them is the same. We will fill your order using the filters we have on hand when you place your order.
How to Build a Passive Bandpass Filter Circuit
http://www.learningaboutelectronics.com/Articles/Passive-bandpass-filter-circuit.php
A bandpass filter is needed if only a certain range of frequencies are needed. An example of uses for bandpass filters are audio applications if only certain frequencies are desired to be heard while others should not. This type of bandpass filter is a passive bandpass filter. It doesn't require any power. It is not used for any active ...
Easy Series - Pacific Antenna - QRP Kits
https://www.qrpkits.com/ezseries.html
Easy Audio Bandpass Filter Features A basic audio filter kit with preamp, op-amp filter and LM386 audio amp to drive headphones or speaker Has a peak in response that is tunable from approximately 300Hz to 2Khz Tuning and volume pots for adjustment Build in 1 …
K4ICY's Home Brew CW Audio Filter
http://www.k4icy.com/cwfilter.htm
This little accessory will add the much needed narrow band filtering to your audio radio's output. The circuit used is an active RC driven filter using Op amps and is pre-constructed for a set frequency range. The circuit was inspired from the ARRL Extra Class study manual's (Volume 8) pages on active filters.
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