230v +9v 0v -9v 10A Power Supply
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MDRC Mark 4 20 Amp Power Supply
The MDRC committee approached the author to take on the role of Electronic Components and Project Officer, which was accepted without hesitation. Upon assuming the position, it became evident that more time would be required than initially anticipated, primarily for...
Soft Start For Switching Power Supply
A switching power supply that has an output voltage significantly lower than its input voltage exhibits a unique characteristic: the current drawn from the supply is less than the output current. However, the input power (UI) is, naturally, greater than...
how to select transformers
The Edcor model that appears to be the most suitable is the GXPP15-8-8K from EDCOR Electronics Corporation. The GXPP15-8-8K is a cost-effective option.
The GXPP15-8-8K is a high-performance audio output transformer designed for use in tube amplifier applications. It features an...
4 order filter with a single IC project PCB
High-order circuit filters are typically designed using two or more cascaded sections. This fourth-order filter requires only one operational amplifier (OA) integrated circuit (IC), which helps achieve lower distortion and reduced intermodulation. The resistor values represent the load on the...
Flyback Power Supply Powers Subscriber Line Interface Circuit
Cable and xDSL modems are increasingly popular, leading to a need for designs that interface with existing telephones at subscriber locations. The subscriber line interface circuit (SLIC) within the modem must ring the phone and provide loop current during conversations....
car battery charger schematics
The circuit is designed to be powered directly by a power supply, which is why it does not include a transformer, rectifier, or filter capacitors in the schematic. However, the addition of these components is possible. To operate the circuit,...
nescaf
The NEScaf filter is designed to offer greater flexibility than previous filters for QRP (low-power) radio rigs. It features two panel-mounted controls: a single center-detent potentiometer that adjusts the center frequency of the filter's bandpass (settable between approximately 415 Hz...
Antialiasing And Sync-Compensation Filter
Two dual-biquad filter chips and some external components form a multipurpose filter to reconstruct D/A converter signals. Connected to a converter's output, the filter provides antialiasing, reduces the D/A converter's quantization noise, and compensates for the "sync" function (attenuation). The...
af filter
The graphs below illustrate the computer predictions of filter performance provided by Harry PA0LQ. Click on the thumbnail to view the full-size graph. A significant challenge in aligning the filter was the lack of access to a frequency counter with...