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betwixt,
Thanks for the feedback. I think I see it now, and I'm a little embarrassed. Probably because I didn't look at the circuit all that closely and noticed that line 2 only has a DC current in it. I had assumed that in order to make this a balanced input, it was tapped off the emitter of...
I’m actually referring to C8 1nF. Lines 1 and 2 are both 48V phantom power lines from a preamplifier. C5 and C6 are blocking caps to prevent DC getting into the preamplifier stage.
Thanks for the replies. I instinctively thought it was CM noise, but I honestly don't "see" it - the charging discharging action of the cap and shunting of the noise, particularly if both ends are at the same potential.
It's also not clear from the second post. Perhaps it depends on what's on...
I occasionally see a capacitor placed between two DC voltages (power rails, input to op amps, phantom power for mics, etc.) in circuits as shown below. I'm thinking it for common mode noise, but I'm not sure.
---V+
/
--
-- capacitor
/
----V+ or V-
Could some elaborate...
rf amplifier for vhf regenerative receivers
Guru;
I don't know what you did to the other two guys in the past....
Anyway guys, this discuss has gone waaaay off topic and has taken a left turn into the tall weeds. Thanks for all your input. This is my last post.
small regen receiver max radio crystal radio
I'm using MultiSim and LTSpice. My LTSpice simulations are incorrect because I had the wrong transistor model. However, the circuit operation is really clear from MultiSim. I was hoping for a little more discussion on the circuits operation from the...
electronic_schematic.php
Family..... Family.... Let's not fight.
Let's agree that it's a low-cost sub-optimal receiver utilized in a similarly inexpensive China-manufactured toy. :D You've got to hand it to them though for finding simple, low-cost solutions that work. They are good at that...
simple fm transmitter using c9018
I have similar questions regarding an RC toy that I am trying to modify from 27 MHz to 49 MHz operating frequency that use a super-regen receiver. These receivers are new to me, and I would like some help on the circuits. I posted elsewhere on another forum at...
rc transmitter circuit
Hi:
I would like some help on the circuits for an R/C toy that I am trying to modify from 27 MHz to 49 MHz operating frequency. I have re-engineered the transmitter and emitter circuits as best as I could. I have included all the circuits below. At first I thought these...
I am doing a bit of reverse engineering on a RC toy transmitter. I have the following components that I am trying to identify. I am fairly certain that three of these are transistors used in a Hartley oscillator and the power supply (probably for regulation). The other might be a 3.3V zener...
rgb to vga circuit
Thanks for the link. I went to that site but I don't remember seeing these chips the first time. I also found a few more at the Philips web site, but these are all obsolete. There are modern chips from TI, Analog, ST, and Philips but they are overkill for my purposes and need...
rgb to vga converter circuit
I need a circuit or chip that will allow me to take a composite NTSC signal and convert (decode) it to VGA (RGB) for an LCD monitor. I have looked around a bit and was surprised that I could not find this circuit, although, there are plenty such consumer products...
Thanks for the reply. I just found this circuit too. I realized that the circuit is nothing more than voice-activated switch (VOX) and did search and this came up. Subtle word changes do make a big difference in Web search results.
standby circuit
I am designing a subwoofer and would like to include an automatic standby circuit to automatically switch it on/off depending on whether a signal is present or not for a certain period of time. I know that this is easily done with a microcontroller, but I want to do it the...
pic16f54
Hi All!
I searched the site but I didn't see a post that addressed my question. Hope I am not duplicating.
Has anyone added the PIC16F54 and 16F72 devices to the Picall software and successfully programmed them on the hardware? It looks simple enough, but I have blown up a few of my...
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