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I am designing a 4 layers PCB. Some parts of the PCB sholud carry a 26V voltage.
I would like to know if there are issues with this stack-up
1) Top copper: +26V plane
2) Internal layer 1: GND plane
3) Internal layer 2: +26V plane
4) Bottom copper: GND plane
I plan to use the following pcb...
I have built a levelshifter for micro-sd card using SN74LVC2T45DCTT. It works on the short term but I would like a point of view on the long term because after some hours of activity one of the two levelshifter exploded.
The signals MOSI, MISO,CLK and CS are connected to an ATMEGA644 working at...
In order to avoid the spurious relay switching, I would like to build a control in such a way that the relay stays in the excitated state for 10 seconds after the control signal has gone low. I would like to build such a control with a single coil bistable relay. Does the following description...
The circuit employs the controller LTC4357 and two N-channel MOSFET IPB011N04L G . The MOSFETs are in parallel and the gate terminals are connected to the "GATE" terminal of the controller with two 10 Ohm resistors. Applying a load of 13A the difference between input and output is 0.03V while...
I am building an ultrasonic generator with a dual frequency (25kHz and 36kHz). When the tweeter is not connected, the circuit works fine. When I connect the tweeter at the H-Bridge, I notice that that the frequency generated by U6 (NE555) has moved to 70kHz. Moreover, the square wave generated...
I would like to reproduce using a 24V battery in order to test a device a solar panel that delivers 18-19V with a maximum current of 300mA. I have built a regulator using the L200 IC with both voltage and current regulation: when the load required more than 300mA the output voltage dropped to...
I would like to build a DC-DC converter that with a command is able to switch its output voltage from 12V to 14.5V. I am thinking about changing the resistor between the FB pin and the SW pin of LM2673 by using solid state relay.
Before building it I am wondering if there are any issues during...
I have built a high side switch using bjt: the circuit is powered with 18V and the base of the NPN transistor is driven by a pulse between 0 and 5V I would like to use a 50mA load. The circuit is in the image attached to the post.
The load is powered only if I remove resistor R1
Here are...
How to put in a correct way the scoring lines on a panel made of PCBs with castellated holes (half vias)? The single PCB is 46x25.4mm and the castellated holes lie on three sides of the PCB
I would like to import a logo in Allegro PCB DEsign version 16.3. I' ve tried to import a dxf file and to map the content into the board geometry class> silkscreen top but I have found an empty board even if the import procedure is successful.
Could you give me some hints?
I am using the balun DEA202450BT-7077A1 which has a balanced port differential impedance of 34+j72 Ohm. In theory in order to avoid reflections the impedance of the lines connecting the balun should be 34+j72 Ohm. But in practice which is a reasonable value for the impedance of the lines? The...
I have begun to design a WiFi device using the module RS9110-N-11-02. I would like to insert together with a chip antenna, a connector for attaching an external antenna. The module application note shows a configuration using a coaxial connector MM8430-2610RA1 and a chip antenna ANT-2.45G.
The...
Hi, I would like to clarify my ideas on E and H plane of an antenna starting from an analytical expression of eletric filed.
For example I am looking to E and H planes starting from the following expression which represents the electric field of a dipole over ground plane oriented along the...
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